I love Karaoke usually, but I have this one horrible memory, still burned into my mind, from Ontario Place in Toronto, years ago back when it was still open:
I was enjoying the evening with my girlfriend, when we stumbled across a small Karaoke stage with a crowd of about 50 people. We stayed and watched a few brave souls get up to sing their hearts out. Some bad, some good, but everyone was having a good time. Eventually, a middle-aged attractive blonde lady gets up there, and, in the most confident manner, addresses a group of 4-5 young girls she was with (nieces or daughters I presume): "Sometimes girls, you just have to be brave, take a chance, and do something crazy!".
Ironically enough, the song was 'Take A Chance On Me' by Abba. She was all smiles as she proceeded to start singing the a cappella harmony intro in the wrong key. Immediately knowing something was wrong, she started to lose her cool, her voice breaking. She plugged away though, struggled through the first verse, then missed some lyrics and eventually completely lost her place. At this point her face was fully red, and seemed to be having some kind of freakout/panic attack. She stopped, and crying, ran off the stage. Her crew of girls looked like they wanted to disappear, hiding their faces in their hands. The audience fell silent, embarrassed for the poor woman. The sole voice was this one guy laughing in the back (surprise, it was me). I actually felt kinda bad about that later, but I just couldn't help myself at the time. Girlfriend dumped me a few weeks later.
Guess her nieces (and the whole audience) learned that sometimes it's best not to be brave, take a risk, and do something crazy after all.