My favorite was changing the oil in my boat. Changed it using one of those pumps that pull the oil out of the dipstick tube with a long skinny tube. New oil in, fire it up, all is well. Cleaning stuff up and getting ready to take it to the ramp . Tube is nowhere to be found. Then it dawns on me that maybe I never pulled the tube. After about an hour, decide to drop the pan which isn't any fun in a boat. Sure enough, the tube is safely wrapped around the crank. Somehow I was able to unwind it and made it out on the water later that day.