This never happened to me, but it (almost) happened to my brother. My brother was playing one of those random free, rarely updated browser pixel fps games on his school computer around the time Pixel Gun 3D came out, when we were both in high school. Games like these were getting popular at this time. So anyways, during lunch, his computer froze and he couldn't do anything about it, and the screen was just a still image of someone jumping at him with a FN Scar (as he told me), and lunch ended right when it froze. He got put in ISS because our school was really strict about these pixel games when they started arising.