The Phillips head screw was used to hold a floating shelf on bedroom wall. The head of the screw became stripped, so my child decided to try to fix the problem themselves by digging out the drywall around the screw and trying to twist it with vice grip pliers. Didn't work and now we are stuck with a screw that is stuck in what seems to be wood or another hard material behind the drywall- basically they hit something hard and decided to ask for help when there was no more drywall to dig.
We tried to remove the stripped screw by adding a rubber band for friction, that didn't work. And there is absolutely no give or rotation with vice grip pliers- the pliers keep spinning around the edge of the screw head and nothing is working.