Nassau County police say the thief walked into a Dunkin' Donuts in Farmingdale just before midnight Tuesday brandishing a silver handgun and demanding money.
An employee, washing trays, tells the New York Post that he turned the water on the bandit, hitting the mask. The thief, clad all in black, fled empty-handed.
Police ask anyone with information to call Crime Stoppers at 800-244-TIPS. Calls are confidential.
In July, a bank robber dressed as "Star Wars" villain Darth Vader made off with an undetermined amount of cash at a Chase bank branch on Long Island.