I absolutely LOVE those one liners. Mainly the horrible pun jokes. Some are just stupid. If you've got any more, throw 'em at me. Note: I stole a few of these from my sister

When is a tractor not a tractor? When it turns into a barn.

Two goldfish are in a tank, one turns to the other and say, "Do you know how to drive this thing?"

What's orange and sounds like a parrot? A carrot...

Two pigs are sitting in a bathtub. One says to the other, "Could you pass me the soap?" So the first one says, "What you I look like, a toaster?"

Did you hear the joke about the missing punchline?

(The following came from my geometry teacher in high school-especially the first one)
What did the acorn say when it grew up? Gee, I'm a tree! (Ge-om-e-try)

Why did the cat fall out of the tree? Because it was dead...

I'm sure I know a few more, but that's all I can think of at the moment.