diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..51889e3
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,10 @@
+FROM golang:1.11-alpine AS builder
+RUN apk add --no-cache git
+RUN go get github.com/pdevine/go-asciisprite
+WORKDIR /project
+COPY surprise.go .
+RUN CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o surprise surprise.go
+
+FROM scratch
+COPY --from=builder /project/surprise /surprise
+ENTRYPOINT ["/surprise"]
diff --git a/Dockerfile.cross b/Dockerfile.cross
new file mode 100644
index 0000000..b302607
--- /dev/null
+++ b/Dockerfile.cross
@@ -0,0 +1,20 @@
+FROM --platform=$BUILDPLATFORM golang:1.11-alpine AS builder
+RUN apk add --no-cache git
+RUN go get github.com/pdevine/go-asciisprite
+WORKDIR /project
+COPY surprise.go .
+
+ARG TARGETOS
+ARG TARGETARCH
+ENV GOOS=$TARGETOS GOARCH=$TARGETARCH
+RUN CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o surprise surprise.go
+
+FROM scratch AS release-linux
+COPY --from=builder /project/surprise /surprise
+ENTRYPOINT ["/surprise"]
+
+FROM microsoft/nanoserver AS release-windows
+COPY --from=builder /project/surprise /surprise.exe
+ENTRYPOINT ["\\surprise.exe"]
+
+FROM release-$TARGETOS
diff --git a/surprise.go b/surprise.go
new file mode 100644
index 0000000..cb6d7c9
--- /dev/null
+++ b/surprise.go
@@ -0,0 +1,198 @@
+package main
+
+import (
+	"math/rand"
+	"time"
+
+	sprite "github.com/pdevine/go-asciisprite"
+	tm "github.com/pdevine/go-asciisprite/termbox"
+)
+
+var allSprites sprite.SpriteGroup
+var Width int
+var Height int
+var random *rand.Rand
+
+const whale_c0 = `xxxxxxxxxxxxxxx##xxxxxxxx.xxxxx
+xxxxxxxxx##x##x##xxxxxxx==xxxxx
+xxxxxx##x##x##x##xxxxxx===xxxxx
+xx/""""""""""""""""\___/x===xxx
+x{                      /xx===x
+xx\______ o          __/xxxxxxx
+xxxx\    \        __/xxxxxxxxxx
+xxxxx\____\______/xxxxxxxxxxxxx`
+
+
+const birthday_c0 = `
+@@@@@@@@@@@(_)@@@@@@@(_)
+@@@@@@@@@@@@#  @(_)@@@#@@@(_)@@@@@(_)
+@@@@@@@@_-.-#=='-#-===#====#=(_)==.#=.==__
+@@@@@@.'    #    #    #    #  #    #      `+"`"+`.
+@@@@@:           #         #  #    #        :
+@@@@@:.                       #            .:
+@@@@@| `+"`"+`-.__                          __.-' |
+@@@@@|      `+"`````"+`""============""'''''      |
+@@@@@|          . . .-. .-. .-. . .         |
+@@@@@|          |-| |-| |-' |-'  |          |
+@@@@@|          ' ' ' ' '   '    '          |
+@@@@@|  .-. .-. .-. .-. . . .-.  .-. . . .  |
+@@_.-|  |(   |  |(   |  |-| |  ) |-|  |  |  |-._ 
+.'   '. '_' '-' ' '  '  . . '-'  ' '  '  . .'   `+"`"+`.
+:      `+"`"+`-.__                          __.-'      :
+ ~.         `+"`````"+`""""""""""""""""'''''         .'
+@@@`+"`"+`-.._                                  _..-'
+@@@@@@@@`+"`````"+`""""-----_____------""""'''''`
+
+type Cake struct {
+	sprite.BaseSprite
+	Timer   int
+	TimeOut int
+}
+
+type Confetti struct {
+	sprite.BaseSprite
+	Timer     int
+	TimeOut   int
+	VY        int
+	VYTimer   int
+	VYTimeOut int
+}
+
+type Flicker struct {
+	sprite.BaseSprite
+	Timer   int
+}
+
+func NewCake() *Cake {
+	s := &Cake{BaseSprite: sprite.BaseSprite{
+		Visible: true,
+		Y:       Height/2},
+	}
+	s.AddCostume(sprite.NewCostume(birthday_c0, '@'))
+	s.X = Width/2 - s.Width/2
+
+	points := []sprite.Point{
+		sprite.Point{12, 0},
+		sprite.Point{22, 0},
+		sprite.Point{17, 1},
+		sprite.Point{27, 1},
+		sprite.Point{35, 1},
+		sprite.Point{30, 2},
+	}
+
+	for cnt, p := range points {
+		f := &Flicker{BaseSprite: sprite.BaseSprite{
+			Visible: true,
+			X:       s.X+p.X,
+			Y:       s.Y+p.Y,
+			},
+		}
+		f.AddCostume(sprite.NewCostume(")", '@'))
+		f.AddCostume(sprite.NewCostume("(", '@'))
+		f.CurrentCostume = cnt%2
+		allSprites.Sprites = append(allSprites.Sprites, f)
+	}
+
+	return s
+}
+
+func (f *Flicker) Update() {
+	f.Timer = f.Timer + 1
+	if f.Timer > 4 {
+		if f.CurrentCostume == 0 {
+			f.CurrentCostume = 1
+		} else {
+			f.CurrentCostume = 0
+		}
+		f.Timer = 0
+	}
+}
+
+func NewConfetti() *Confetti {
+	s := &Confetti{BaseSprite: sprite.BaseSprite{
+		Visible: true},
+		Timer:   0,
+		TimeOut: 3}
+	s.AddCostume(sprite.NewCostume(whale_c0, 'x'))
+	s.AddCostume(sprite.NewCostume(whale_c0, 'x'))
+	s.X = random.Intn(Width)
+	s.Y = -random.Intn(Height)
+	s.VY = random.Intn(2) + 1
+	s.VYTimer = 0
+	s.VYTimeOut = 2
+	return s
+}
+
+func (s *Confetti) Update() {
+	s.Timer = s.Timer + 1
+	s.VYTimer = s.VYTimer + 1
+	if s.Timer > 2 {
+		if s.CurrentCostume == 0 {
+			s.CurrentCostume = 1
+		} else {
+			s.CurrentCostume = 0
+		}
+		s.Timer = 0
+	}
+	if s.VYTimer > s.VYTimeOut {
+		s.Y = s.Y + s.VY
+		if s.Y > Height {
+			s.Y = 0 - s.Height
+		}
+		s.VYTimer = 0
+	}
+}
+
+func main() {
+	// XXX - Wait a bit until the terminal is properly initialized
+	time.Sleep(1000 * time.Millisecond)
+	random = rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	err := tm.Init()
+	if err != nil {
+		panic(err)
+	}
+	defer tm.Close()
+
+	Width, Height = tm.Size()
+
+	event_queue := make(chan tm.Event)
+	go func() {
+		for {
+			event_queue <- tm.PollEvent()
+		}
+	}()
+
+	for n := 0; n < 40; n++ {
+		c := NewConfetti()
+		allSprites.Sprites = append(allSprites.Sprites, c)
+	}
+	cake := NewCake()
+	allSprites.Sprites = append(allSprites.Sprites, cake)
+
+	txt := "Press 'ESC' to quit."
+        c := sprite.NewCostume(txt, '~')
+        text := sprite.NewBaseSprite(Width/2-len(txt)/2, Height-2, c)
+	allSprites.Sprites = append(allSprites.Sprites, text)
+
+mainloop:
+	for {
+		tm.Clear(tm.ColorDefault, tm.ColorDefault)
+
+		select {
+		case ev := <-event_queue:
+			if ev.Type == tm.EventKey {
+				if ev.Key == tm.KeyCtrlC || ev.Key == tm.KeyEsc || ev.Ch == 'q' {
+					break mainloop
+				}
+			} else if ev.Type == tm.EventResize {
+				Width = ev.Width
+				Height = ev.Height
+			}
+		default:
+			allSprites.Update()
+			allSprites.Render()
+			time.Sleep(30 * time.Millisecond)
+		}
+	}
+}