You don't know? That's right, you know, because you weren't there, man!
When it's pure bread.
Because he knows where the naughty girls live. (a kid told me this one)
Three. One to do it, one to complain that it has already been done before, and one to repost this joke.
Addadictomy.
Technically, just two, but it is really hard to get them to breed in captivity.
It depends on the definition of lightbulb.