oh yes, my rotary cutter hit a wrinkle or something and skipped over my ruler and cut my thumb. it took four hours to stop bleeding but by then i was sitting in the emergency room. they only had to cover it with a ton of gauze. later i had to wear a metal guard on it when working until the nerves stopped being so sensitive.
i recommend the rotary Olfa that will automatically move the blade back in closed position when you take your hand off. safety. no cut feet if dropped or digging around on your cutting table.