Ooops. Pressed the wrong button...
Obviously there was John Smeaton at Glasgow aiport.
But I remember someone from the PFLP claimed responsibility for September 11th. Almost immediately an obviously panicked leadership not only denied all knowledge but also condemned the attacks. I think I just found it grimly amusing to hear a bunch of terrorists getting scared. On the other hand, it was also a sign of how serious and effective the attacks were, that the world had obviously changed - and even a bunch of terrorist has-beens (I'm not sure they were all that effective even back in the 70s/80s) could see it immediately.
Generally though, I think black humour is a healthy sign.
It got a friend of mine a new nickname. He was in Sudan at the time. He's got a nice big beard, and his new nickname at football was Osama...