Because everyone was calling him a bone-head. (I was 6 when I came up with that).
because Santa came early! I'll let myself out.
Look out for the mice!
A fart. It will cut through your pants and not even leave a hole.
H Edit: I don't like explaining jokes but since the first guy didn't get I might as well: When pronounced in a French accent it sounds like ash.
Lettuce turnip da beet!
Toad was a fungi.
Because in charge Yoda was.
A 6-pack and a potato.
Because he had to go with.
They're drop dead gorgeous!