Why did the rabbit cross the road?
Because he was chicken!
[Note, you can replace any manner of living being for 'rabbit' and it works.]
I made this joke up myself, I think. If you don't get it, well poo on you. It makes me snicker every time I think of it.
If you want funny answers to the original joke, why did the chicken cross the road, then go here.
If you want a game based on the joke, the go here.
If you want to see a person not being a chicken crossing a busy road in India, then go here. (Oh, it reminds me so much of crossing the street in Vietnam!)