diff --git a/doomsday/client/include/client/clplanemover.h b/doomsday/client/include/client/clplanemover.h
index 8e02c3dfed..cd8706acc9 100644
--- a/doomsday/client/include/client/clplanemover.h
+++ b/doomsday/client/include/client/clplanemover.h
@@ -51,9 +51,6 @@ class ClPlaneMover : public ThinkerData
      * @return The mover thinker. Ownership retained by the Plane's Map.
      */
     static thinker_s *newThinker(Plane &plane, coord_t dest, float speed);
-
-protected:
-    static void thinkerFunc(thinker_s *mover);
 };
 
 #endif // DENG_CLIENT_PLANEMOVER_H
diff --git a/doomsday/client/include/client/clpolymover.h b/doomsday/client/include/client/clpolymover.h
index 6a37468751..985ae639ce 100644
--- a/doomsday/client/include/client/clpolymover.h
+++ b/doomsday/client/include/client/clpolymover.h
@@ -42,9 +42,6 @@ class ClPolyMover : public ThinkerData
     void think();
 
     static thinker_s *newThinker(Polyobj &polyobj, bool moving, bool rotating);
-
-protected:
-    static void thinkerFunc(thinker_s *mover);
 };
 
 #endif // DENG_CLIENT_POLYMOVER_H
diff --git a/doomsday/client/include/world/polyobjdata.h b/doomsday/client/include/world/polyobjdata.h
index ba59a5bc7e..5696b62f50 100644
--- a/doomsday/client/include/world/polyobjdata.h
+++ b/doomsday/client/include/world/polyobjdata.h
@@ -47,6 +47,7 @@ class PolyobjData : public Thinker::IData
     ~PolyobjData();
 
     void setThinker(thinker_s *thinker);
+    void think();
     IData *duplicate() const;
 
 #ifdef __CLIENT__
diff --git a/doomsday/client/src/client/clplanemover.cpp b/doomsday/client/src/client/clplanemover.cpp
index 731f5c029e..125a7cf682 100644
--- a/doomsday/client/src/client/clplanemover.cpp
+++ b/doomsday/client/src/client/clplanemover.cpp
@@ -33,7 +33,6 @@ using namespace de;
 thinker_s *ClPlaneMover::newThinker(Plane &plane, coord_t dest, float speed) // static
 {
     Thinker th(Thinker::AllocateMemoryZone);
-    th.function = (thinkfunc_t) thinkerFunc;
     th.setData(new ClPlaneMover(plane, dest, speed));
 
     // Add to the map.
@@ -142,8 +141,3 @@ void ClPlaneMover::think()
         }
     }
 }
-
-void ClPlaneMover::thinkerFunc(thinker_s *mover) // static
-{
-    THINKER_DATA(*mover, ClPlaneMover).think();
-}
diff --git a/doomsday/client/src/client/clpolymover.cpp b/doomsday/client/src/client/clpolymover.cpp
index 98e4afd2f9..27eb22353f 100644
--- a/doomsday/client/src/client/clpolymover.cpp
+++ b/doomsday/client/src/client/clpolymover.cpp
@@ -41,7 +41,6 @@ thinker_s *ClPolyMover::newThinker(Polyobj &polyobj, bool moving, bool rotating)
     }
 
     Thinker th(Thinker::AllocateMemoryZone);
-    th.function = (thinkfunc_t) thinkerFunc;
     th.setData(new ClPolyMover(polyobj, moving, rotating));
 
     thinker_s *ptr = th.take();
@@ -125,8 +124,3 @@ void ClPolyMover::think()
         _polyobj->map().thinkers().remove(thinker()); // we get deleted
     }
 }
-
-void ClPolyMover::thinkerFunc(thinker_s *mover)
-{
-    THINKER_DATA(*mover, ClPolyMover).think();
-}
diff --git a/doomsday/client/src/world/polyobjdata.cpp b/doomsday/client/src/world/polyobjdata.cpp
index 5386dfbbd9..748761d89a 100644
--- a/doomsday/client/src/world/polyobjdata.cpp
+++ b/doomsday/client/src/world/polyobjdata.cpp
@@ -43,6 +43,11 @@ void PolyobjData::setThinker(thinker_s *thinker)
     _polyobj = (Polyobj *) thinker;
 }
 
+void PolyobjData::think()
+{
+    // nothing to do; public thinker does all
+}
+
 Thinker::IData *PolyobjData::duplicate() const
 {
     return new PolyobjData(*this);
diff --git a/doomsday/client/src/world/thinkers.cpp b/doomsday/client/src/world/thinkers.cpp
index a1e5ccd75b..51400bc763 100644
--- a/doomsday/client/src/world/thinkers.cpp
+++ b/doomsday/client/src/world/thinkers.cpp
@@ -443,7 +443,11 @@ static int runThinker(thinker_t *th, void * /*context*/)
             initPrivateData(th);
         }
 
+        // Public thinker callback.
         th->function(th);
+
+        // Private thinking.
+        if(th->d) THINKER_DATA(*th, Thinker::IData).think();
     }
 
     return false; // Continue iteration.
diff --git a/doomsday/libdoomsday/include/doomsday/world/thinker.h b/doomsday/libdoomsday/include/doomsday/world/thinker.h
index be3eeb6d97..9acb20c9e2 100644
--- a/doomsday/libdoomsday/include/doomsday/world/thinker.h
+++ b/doomsday/libdoomsday/include/doomsday/world/thinker.h
@@ -67,6 +67,12 @@ LIBDOOMSDAY_PUBLIC dd_bool Thinker_InStasis(thinker_t const *thinker);
  */
 LIBDOOMSDAY_PUBLIC void Thinker_SetStasis(thinker_t *thinker, dd_bool on);
 
+/**
+ * Generic thinker function that does nothing. This can be used if the private
+ * data does all the thinking.
+ */
+LIBDOOMSDAY_PUBLIC void Thinker_NoOperation(void *thinker);
+
 #ifdef __cplusplus
 } // extern "C"
 #endif
@@ -123,6 +129,7 @@ class LIBDOOMSDAY_PUBLIC Thinker
     public:
         virtual ~IData() {}        
         virtual void setThinker(thinker_s *thinker) = 0;
+        virtual void think() = 0;
         virtual IData *duplicate() const = 0;
 
         DENG2_AS_IS_METHODS()
diff --git a/doomsday/libdoomsday/include/doomsday/world/thinkerdata.h b/doomsday/libdoomsday/include/doomsday/world/thinkerdata.h
index f39f27b95a..d6375c9228 100644
--- a/doomsday/libdoomsday/include/doomsday/world/thinkerdata.h
+++ b/doomsday/libdoomsday/include/doomsday/world/thinkerdata.h
@@ -40,6 +40,7 @@ class LIBDOOMSDAY_PUBLIC ThinkerData : public Thinker::IData
     ThinkerData(ThinkerData const &other);
 
     void setThinker(thinker_s *thinker);
+    void think();
     IData *duplicate() const;
 
     thinker_s &thinker();
diff --git a/doomsday/libdoomsday/src/world/thinker.cpp b/doomsday/libdoomsday/src/world/thinker.cpp
index fe54736090..26e316f15c 100644
--- a/doomsday/libdoomsday/src/world/thinker.cpp
+++ b/doomsday/libdoomsday/src/world/thinker.cpp
@@ -111,12 +111,18 @@ DENG2_PIMPL_NOREF(Thinker)
 Thinker::Thinker(dsize sizeInBytes, IData *data)
     : d(new Instance(AllocateStandard, sizeInBytes, data))
     , STRUCT_MEMBER_ACCESSORS()
-{}
+{
+    // Default to no public thinker callback.
+    function = Thinker_NoOperation;
+}
 
 Thinker::Thinker(AllocMethod alloc, dsize sizeInBytes, Thinker::IData *data)
     : d(new Instance(alloc, sizeInBytes, data))
     , STRUCT_MEMBER_ACCESSORS()
-{}
+{
+    // Default to no public thinker callback.
+    function = Thinker_NoOperation;
+}
 
 Thinker::Thinker(Thinker const &other)
     : d(new Instance(*other.d))
@@ -275,3 +281,7 @@ void Thinker_SetStasis(thinker_t *thinker, dd_bool on)
     }
 }
 
+void Thinker_NoOperation(void *)
+{
+    // do nothing
+}
diff --git a/doomsday/libdoomsday/src/world/thinkerdata.cpp b/doomsday/libdoomsday/src/world/thinkerdata.cpp
index ffec23c3df..dc87e84cf2 100644
--- a/doomsday/libdoomsday/src/world/thinkerdata.cpp
+++ b/doomsday/libdoomsday/src/world/thinkerdata.cpp
@@ -58,6 +58,11 @@ void ThinkerData::setThinker(thinker_s *thinker)
     d->think = thinker;
 }
 
+void ThinkerData::think()
+{
+    /// @todo If there is a think function in the Record, call it now. -jk
+}
+
 Thinker::IData *ThinkerData::duplicate() const
 {
     return new ThinkerData(*this);