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Police in Coventry, Rhode Island, are looking for an understandably frustrated man who tried to rob a Subway sandwich shop but was foiled by two teenage clerks who did what teenagers do best — they ignored him.

Coventry, Rhode Island, police are seeking a robbery suspect who walked out of a Subway when the clerks ignored him. Coventry, Rhode Island, Police Department

The man was described as being in his mid-40s to mid-50s, heavyset and wearing what appeared to be a white T-shirt tied to the top of his head with a tan plastic shopping bag, Coventry police said.

When he demanded money at the counter Tuesday, "the two teenage employees did not respond to the suspect," they said.

The man — who looks exasperated in security camera video of the incident — "became agitated and mumbled something under his breath as he walked out of the business," police said.

Police said Thursday a second man who was seen earlier at a liquor store with the suspect had spoken to investigators and wasn't considered a person of interest.