ok, I have two, first, when I bought diapers for the first time when I was 19, i hadnt worn one in a long time. Not being a person who had any younger siblings and with no friends with babies, and further never having changed a diaper, i didnt really know how to put one on. So, it ended up backwards, I laughed at myself pretty good for that.
Another time, and at the time I had roomates so I was afraid to keep diapers around. I got hammered at the pizza place and got back and got to thinking I really wanted to wear a diaper. I went to three stores who didnt have them until finally reaching ralphs. I staggered to the clerk in the back at the pharmasutical counter hoping not to attract attention to myself, buy them, and proceed out the door. 10 feet outside the door, the manager comes booking out and yells STOP! I turn, and look around, wondering if it was me he was talking to and it was. He asked if I was gonna pay for them and I showed him I had, pointing to my receipt which was discarded in an ashtray. Trying to cover for himself he asked if I needed the receipt in case they were no good. I only chuckled saying no, but thinking "theres no way to dig yourself out of a situation like this man" and walked away.