Then I remembered--some guy had emailed me about a camera lens I was trying to sell on eBay, and offered to send me a check for it if I would ship it to him. I said "ok" in case he was legit, but I suspected he wasn't.
So here it is, my trophy. A ridiculously bad fake check. Note the strange mix of fongs -- Arial, Times, and Comic Sans. The smudge from my wetted finger.
Notice the signature. Look familiar? It's George W. Bush!
Bottom line, don't ever accept overpayment for a Craiglist item from a stranger, who wants you to return the overpayment via Western Union. It is 100% scam.