KEY WEST, Fla. (AP) — Always remember to tip your server, if you know what’s good for you.

A tourist left a bad impression in a Key West bar by ordering drinks three times on New Year’s Eve without leaving a tip.

The memory stuck with the bartender, who helped police identify the Christmas tree arsonists who damaged the city’s iconic buoy at the Southernmost Point in the United States.

The Miami Herald reports that bartender Cameron Briody recognized the man who stiffed him in a webcam video of the arson.

He and his manager then matched credit card receipts and security videos from the bar to help police crack the case.