My mum thought I was lookin at porn one time when I wasn't coz I jumped when she walked into the room. But other than that, nope... not while beating off anyway...
People have a nasty habit of knocking on my door then walking straight in without waiting for my reply... my gf stays over on the weekends... yeah. My Mum's learned that she can talk to me without having to open the door or if she's bringing in washed clothes she can open the door a crack and drop em on the floor
Should probably get a lock for my door.
In my experience the people who walk in on it are more embarrassed than the people caught in the act, and rightly so.