Five: One to change the bulb and four to pull the ladder out from under him/her.
or
When it's going cheep!
Did you hear the one about the crow and the telephone pole?
He wanted to make a long distance caw.
or
and then it dawned on me.
or
In a hambulance.
or
Can I have your hand, hand, hand, hand, hand, hand, hand, hand in marriage?
or