My kids are playing through the entire Zelda series in order. They're currently on Majora's Mask. When they finish a game I tell them about glitches I know and show them speedruns and TAS's etc, so when they finished OoT they got to learn about ISG and bomb hovering and all the silly things like Ocarina Items etc etc.
But of course now, from watching Dad ISG, they figured out how to do it themselves and occasionally ISG for fun when playing MM. And the save system in MM is so fragile it seems to me; when one of them pulls off ISG and then goes and stands in front of e.g. an owl statue, and there are sparks flying like crazy -- is it possible to freeze the game this way? I also worry about them somehow getting stuck on a ledge with ISG on.
Am I just being paranoid? Obviously the game doesn't expect to be in this situation, so it wouldn't surprise me if they crashed it, but if they crash it they might lose a lot, and if they corrupt a save file they might lose everything -- we've only got 2 slots to play with of course, and one slot is Dad's 100% file which they ain't allowed to look at yet :-). Am I worrying about nothing or can they screw themselves up goofing around with ISG? FWIW, they've just finished the 2nd dungeon and are trying to figure out where Romani Ranch is :-)