Think twice before eating those dropped crumbs off your computer keyboard — you might as well be eating off a toilet seat, according to a new study on the amount of germs on keyboards.

A study by British consumer magazine Which? Computing asked a microbiologist to examine 33 keyboards in a typical London office, a toilet seat and a toilet door handle, for bugs generally found in unhygienic places. Four keyboards were judged potential health hazards and the microbiologist recommended the removal of one keyboard as it had 150 times the pass limit of bacteria — five times filthier than the swabbed toilet seat.

“Most people don’t give thought to the grime that builds on their PC, but if you don’t clean it, you might as well eat your lunch off the toilet,” said the editor.