Because the chicken was on vacation.
or
I scream!
or
The blonde responds to the husband, "Shut up...you're next!"
or
Two. One to exploit the proletariat, and one to control the means of production!
or
One is really heavy, the other is a little lighter.
or
Because it goes good with chips.
or
Drinking, bathing, washing, swimming, etc.
or
The cow that jumped over the moon
or