Avoid the Gray Body Paint

The most terrifying moment I have experienced during a convention was getting caught in an elevator for 6 floors with a group of Home-stuck cosplayers, which are literally Trolls. They're very loud, usually very strange, and most of the ones I've encountered are incredibly rude.
But I got caught with three of them surrounding me in this elevator. One girl standing to the side, and two guys on the other sides, on the fourth side was the elevator door. One of the boys was wearing a Mrs. Clause dress and they were all covered in grey body paint. Home-Stuck cosplayers always are.
But the worst part of it all was the fact that when I got in they closed in on me and started beat-boxing in my ear, the one in the dress started rapping. I can't remember any of the words, all I remember is how fast I ran out of the doors when they finally opened on my level and the look of amusement on my friends' faces when I told them about it later.
But personally, they scare me greatly, I now avoid the gray body paint.