A personal favorite thread of mine from the days at JPL. Post all types of jokes, riddles, puns and whatnot for us to laugh (or cringe) at!
Whaddya call a fish with no eyes?
Why is Helen Keller a bad driver?
"A creature of the future, built with pieces of the past!"
"This is the most dangerous creature that ever walked the Earth!"
"That thing cannot leave this building."