Nowdays I don't bring it anymore, but I used to bring it to classes and play every moment I could.
I find it weird that a certain teacher would always be annoyed at the fact that I played games while his class, but he didn't care about the noisy people who can't stop chatting and make it difficult to focus on the actual study... Because I still heard him and replied when asked, I didn't use any headphones at class, so it wasn't that I wasn't paying attention to it (used to play Picross and other games that don't require much mind into it, anyways).
Limited people.