Man, it happens so quick. One minute you are grinding rust off a boat trailer and the next thing you know your shirt is wrapped up in the grinder and you are looking in the driveway for one of your nipples. Those things are dangerous. There should be some sort of safety guard or warning labels on them.
When I was a teenager my friend was baking a cake and the hand mixer she was using did about the same thing with her shirt it was quite comical !!