My sophomore year we got a new world history teacher, and he ALWAYS wore long sleeves. We live in California, so it would get searing hot, but he never even so much as rolled them up. He was pretty young, maybe 28 or so, and he was totally the opposite of stuffy teacher, but he looked it!
It turns out that he thought he would get fired if he showed his tattoos at all, which he had on his forearm. Stars for his marriage, birth of his first child, and then another for when he turned 5. He got one more with the birth of his second boy.
He finally realized it was no big deal when our vice principal came through the class one day wearing shorts and had a huge tattoo on one of his calves, and another on his arm from when he was in the military. I don't think I've seen that teacher cover those tattoos up since!
Also, he had mentioned he had tattoos before, or at least insinuated he did in our class. Once a month we would get 20 minutes of free for all class discussion, any subject (within boundaries) and tattoos came up. Someone mentioned they wanted a tattoo, someone else brought up that they should put it on their butt

He quickly responded not to, as it hurts more than you would think, and drinking and tattoo parlors don't mix, before he changed the subject.
I should also mention that this guy won teacher of the year by a land slide his very first year teaching, and state testing scores went through the roof with him. He does a great job, tattoos or not!
