One strange flex of mine was literally just making five people in a room collectively wretch at the same time. see, I am double jointed in my arms, so i can easily get my arms to point directly parallel to my face, or, with a little effort, make one of my arms rotate 270 degrees. Like, my left elbow will point to the right side. I do this, and five people just gag, and I laughed so hard that day.