I think my first gig was at my junior high but my first club gig was when I was 16 or so. I kicked my guitar chord out of the jack. Nobody seemed to notice, they just kept dancing. So I pretended nothing was wrong and just plugged it in after the song was over.
But after that I got a longer chord and made sure I always looped it through my strap so it is difficult to kick the chord out...
On the next gig, the drummer had to leave the stage to go to the bathroom. That was embarrassing. People notice that sort of thing.