Below is an awesome (real) sign from someone’s Flickr photoset. There was a contest on Fark to caption it, and some of the results were riotous.

Don’t transport pebbles in your mouth; you could sink the boat.

When that rolling tire slams you into the rail, you’ll surely blow chunks.

No running on the deck! We have determined the precise “ball racking” height of the guardrails.

Danger! Do not run into groin-level railing when escaping.

Be careful not to bump your head on minor constellations.