[saalweachter]

This is an absurdly common request from small children.

If you don't do it, you may still find them eating around the crusts, for instance if you cut a sandwich in half, or even gnawing through a single point on the sandwich's crust and then leaving behind a crust-rind when they're done.

As a parent, you're then left with no other choice than to eat all of the grilled cheese rinds yourself, so you don't tend to push too hard on the childish habit.