I remember once when James came rolling back into the garage at Jim's in a 16V, rather quickly, stands on the brakes, pops the hood, gets out, opens the hood, looks down into the smoke, slammed the hood, and walked away mumbling profanities.....
It seems he had forgotten to reinstall the filler cap on the car he was checking for an oil leak after having thuroughly cleaning the engine....
It happens to all of us one time or another....