Mine was a bench competition. Totally random, I didn't train or prepare for it, I just benched and decided to do it. It was early 2005(?) I think.
I didn't know anything about how important body weight could be, so I ate a big breakfast, drank a huge cup of coffee, and then went to weigh ins. I weighed in my clothes, just took my shoes off. I benched RAW and ended up in second place, losing by 0.25 pounds to a woman who benched with a shirt on. Would have won the meet if I had not eaten before weigh ins. LOL. I had a great time and was hooked after that.