These guys just learned a filthy lesson on why you should be very careful what you put in your mouth.

Getty Images

Some thieves in western Australia wanted to siphon gas out of a tour bus last week. They snuck up to it in the middle of the night, stuck a hose in the tank, and started sucking on it to get the gas flowing. Only they put the hose in the wrong place. So instead of siphoning gas, they were siphoning from the sewage tank.

A police sergeant says, "We can infer they [made] a very hasty retreat, with a somewhat bitter taste in their mouth." The cops are trying to track them down.

Read more at Yahoo!