It can be very funny when something goes wrong. Some of my favorites:
A former boss didn't closely review the pics taken by the photographer before sending everybody a link to the website. There were a bunch of her with wet hair, no makeup, and wearing only a slip posted, for all to see.
My brother's best man forgot to pick him up and take him to the wedding.
A friend's incredibly overbearing MIL tried to take over everything at the reception. She was marching to the back of the banquet ball to give a waiter a piece of her mind when she slipped on a spilled drink, landed on her butt, and slid to the wall, ending up with her legs in the air and her dignity shredded. Especially when everyone started laughing.