I just did this for the first time this week. We were all very drunk.
I had no intention of taking it seriously and just wanted to do something stupid with friends.
The thing I noticed is almost everyone there completely ignored the singing, unless it was someone at their table. Except this couple. How weird is this:
I was amazingly awful. I didn't expect to be good, but I chose "Why don't we get drunk and screw" because it is basically a monotone, and it's short, and has about 30 words. They don't give people the hook at karaoke bars, but halfway through the song the dude turned the lyrics on over me. I would like to progress from painfully awful to amusingly awful, if anyone has suggestions.