La bombilla... ¡chao, chiquilla!

Professor Bacterio has devised a light bulb whose effluvia had to give clarity of thought to whoever was nearby, but instead causes everyone who is affected by them to do things backwards (the agents shoot themselves instead of the target, the mice become friends with cats, etc.). Mortadelo and Filemón must identify those contaminated by the Bacterium invention to prevent the effects from spreading.