Just as you can't yell "fire" in a crowded theater, don't even think about yelling "bomb" in the subway.

Police are looking for a man who was seen onboard a northbound L train leaving the Bedford Avenue station at around 5:45 p.m. on Saturday. The suspect yelled "bomb," counted down from five and then yelled "boom," police said.

A passenger took a picture of the suspect with her cell before exiting the train at the 1st Avenue station.

The man is described as a Hispanic male, bwteen 30 and 40 years of age, about 5 feet 10 inches and last seen wearing a white t-shirt and blue pants.

From NYPD:

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime Stoppers website or by texting their tips to 274637 (CRIMES) then enter TIP577. All calls are strictly confidential.