6... that's kinda mean, but that's how you get a joke. Crude humor...
How do you put an elephant in a refrigerator?
You open the door, put the elephant in, and close the door.
How do you put a giraffe in a refrigerator?
You open the door, take the elephant out, put the giraffe in, and close the door.
Alligator is having an animal party, he invites everyone, but who can't come?
Giraffe! Cause she's stuck in the refrigerator, duh!
I'm crossing piranha infested waters, how do I get across?
I swim, all the piranhas are at the animal party!