THIS IS NO JOKE. When I threw a beach party, all the guests turned up, but with the first lot of guests to arrive was none other than the reaper himself! He wasn't floating, and didn't have his scythe, so he was going to act normally. He went down to the beach, and when I followed him to talk, surprise surprise, there was ANOTHER Grim reaper playing the guitar! This HAS to be a glitch. I have photos of the screenshots of the scene (see below). I think this is just a lucky break or something, or its because I used the meteor strike karma power a lot because I was bored, and I ended up killing heaps of sims, which made Grim appear heaps (one time at the gym, he used the treadmill after he was done reaping, and at the bar, he sat down in a chair, but he left afterwards). I did not invite grim, nor could I, because he wasn't on the list of invitees.
Screenshots: