really corny and cheesy jokes

What are some of your favourite cheesy or corny old jokes? The ones that make you just groan until you can't help but laugh?

Here's one I love that my sister told me:

A string walks into a bar, and tries to order a drink. The bartender tells him, "you'll have to leave. We don't serve strings here." So the string leaves, dejected.

The string comes back about an hour later - wearing a hat and a pair of glasses. The bartender isn't fooled,and throws him out again. "We don't serve strings here."

So the string gets an idea. He goes down to the rough part of town and gets himself really roughed up - broken strands, all looped around himself until he's totally tangled. Then he goes back to the bar.

He goes up to the bar and orders a drink. The bartender squints at him and says, "Aren't you that string that's been coming in here?"

The string says, "No. I'm a frayed knot."


Groan!

What are your favourite groaners?