A furious customer beat up a store clerk after he was denied a refund for a disappointing adult film he watched in a gay sex shop!

According to reports, the attacker called it “rubbish” and demanded his money back from staff. But when they refused, he marched out of Mystery Hall Sex Shop in St. Pauli, Germany, only to return a few minutes later to start a fight.

That’s when the sales assistant was knocked out cold by the suspect, then he pocketed $540 from the cash register and took off.

This had to be one of those Michael Lucas films. Rubbish indeed.