there was a science teacher in my high school was was wacky and entertaining. on the first day of class, he had us watch a carl sagan video and i was half paying attention and out of the corner of my eye i saw people enter and leave the room. At one point, i looked around to see if the teacher was looking (so i could go on my phone) and i couldnt find him but then i saw something on the floor: the teacher was lying down, arm in the air, rotating his wrist. I just stared at him and looked around to see if anyone else noticed and like 3 people noticed me staring and looked down. One kid went “uh are you ok?” to which the teacher replied “yep just getting the blood going”. He apparently did that during lunch too as like exercise.
Another time, i was sitting in one of the science classrooms and I had my legs crossed on the chair and moved them (still crossed) to rest on the edge of the table. It’s hard to describe but it’s a weird position and i’ve been asked multiple times if that’s comfortable (it is). The same teacher walked in and went (very bewildered) “wow you have.. very flexible hips”.