Found Pun: Asphalt

I did a search for "classic puns" on Google, and the first hit was a gather.com page featuring a list of puns. Most notably:

A man walks into a bar with a slab of asphalt under his arm and says: "A beer please, and one for the road."

As is common with the internet, many of the jokes here are called puns but aren't actually puns. (For example: “Doc, I can’t stop singing ‘The Green, Green Grass of Home.’" "That sounds like Tom Jones Syndrome." "Is it common?" "Well, It’s Not Unusual." A good joke, but not a pun.)

BUT, regardless, a quality list with some classic groaners.