Karaoke is not for everyone, and it's ten times worse when you have an actual good singer present. We all know why that is. They hog the microphone, they take it too seriously, they pick obscure songs (probably musical theater), and belt crazy notes that don't actually sound as good as they think. In short, karaoke is only fun when everyone in the group is on the same page about what this is. You can either have a room full of show-offs and legitimate singers, or you can have a room full of non…