From an AP article of the same title in The Detroit News:

A Wal-Mart cashier who posted a joke on his MySpace Web page lost his job after the company apparently perceived it as a threat.

David Noordewier, of Lapeer County's Almont Township, posted a joke that suggested average IQs would increase if a bomb were dropped on every Wal-Mart store. He said he thought it was crude, but funny.

His bosses at the store in Macomb County's Shelby Township disagreed, and fired him Feb. 27.

He said he believes a co-worker who disliked him copied the MySpace page and showed it to his boss.

"If you have a MySpace site, you better act like you're a politician," he said. "Be politically correct and don't try to be funny."