Stupid things you have done

As mentioned a few times, forgot to put convertor in a trans before putting it in. Changed the oil on one of my old beaters and forgot to check if the o-ring had come off with the old filter. Leaked like a b&tch. Big hurry one day putting a starter in my 79 Regal with the Pontyrat 301 in it and did not realize that the cable was lightly touching the exhaust manifold. Managed to get 10 miles form home before melt down occurred. Had a brand new battery in it. Battery did not explode, but it expanded to almost double its size. Was still hot 2 days later when I bought it back to Napa at there request. They gave me a new one, mine sat on the counter for several years as a reminder to not be a knucklehead.