They've already told you.
Everything you say goes in one ear and out the udder!
Thought of this one on my own while playing WoW a couple days ago and I'm pretty sure it hasn't been told before. I like corny jokes. I Googled it and didn't find anything (:
There isn't a single person left! Bwahahahahaha
Finding a sack of hatched spider eggs in your room
A pilot what else would you call him? You racist prick!
A PILOT, YOU RACIST!