Someone at Pump Gyms in Northampton, England has been doing a little too much pumping of themselves.

Mohammed Ali – no relation – says he was working out between midnight and 1:30am recently and left his workout towel hanging up as he used the potty. When he came back, he saw a wet, white substance stuck to that same towel.

At first, he thought it was shampoo that dripped onto it during his shower…It wasn’t. Now, police are investigating which of the other gym members had the gall to “beat the bishop” on Ali’s towel. According to Ali, the police and gym management have been ultra-cooperative while looking into something so nasty.