Yes... Its really annoying
I was boring Saki's Fruits Basket manga, And I was on my desk in History and my teacher picked it up and started reading it. xD I had to show her how it works.
Also in History, We had a substiude teacher cause our normal one was somewhere. And I had my Chobits manga, and I had finished everything we had to do so I started reading it. Then he came up to me, Picked it up out of my hands and started reading it! My heart was pounding because there is this really rude thing in it at the beginning, I was hoping he wouldn't see it. Thankfully, I don't think he did.
xD