So would you believe I told my pal a Flight 93 joke? It missed the mark.
Maybe your friend didn't like the joke. Did you try a different approach?
I told my friend a Bali bombing joke and he missed it.
Just understand that many people do not find terrorist jokes as humorous. Even if your intention was good, this may be the reason why they didn't laugh.
I tried telling a joke to my friend's kid and she didn't get it.
Maybe joking about something else would be a better idea. There are plenty of other topics that do not involve violence of innocent victims.