Because they would crack each other up.
Henopause
First we steal two Eggs
She had two pounds of crack in her knickers.
The White-Power Ranger I came up with this after reading a cracked article.
If God was a woman sperm would taste like chocolate
Pupil: I expect it's around Hadrian's garden miss!
Ten. (Shame this one doesn't work too well for reddit - the funniest part of this joke is the third punchline enjoying people struggle to understand what the hell you're talking about.)
To recycle a joke from the other side.
