I though we should have one topic like this here.
My latest was to start my 450SMR where I put a new K&N cone air filter instead of the air box, and started it up while i forgot to remove the plastic bag on the K&N!! The thing just got really small in size!!D:D
One of my best, was about 15 years ago, I was working on a 56 Desoto. It was a 4 door so we were just taking it apart. The car has not been started since 1961 per the previous owner. Well the original carb on that desoto is normally opened and held chut with the a spring. well, the spring was not on! I rigged a gas can on the roof and rigged electrical and got it started. Went to 50000000000 RPM in 2 seconds. There was no switch to shut it off, and the work light cord got caught in the fan, everything started flying , i was running away from it, I came back to pull the gas line off to try to kill it. So, it finally died...... I looked over on the other side of the and the work light was sitting on top of the hood of a 65 caddy we just painted......:D