Clicking, Buying, Drinking

STEPHEN KENNY remembers being in high spirits one evening after imbibing “one martini or maybe three ” on his way home from work. He was in such a good mood, in fact, that he decided to get his girlfriend a present.

“I logged on to this luxury jewelry Web site and I bought her a pair of $1,500 earrings — or what I thought were $1,500 earrings,” said Mr. Kenny, who works at an intellectual property law firm in Burlington, Vt. “Maybe my vision was blurred or I just missed a decimal point, but they turned out to be $15,000.”

Just say no!