I've had that happen. Its a hassle but stores do remove them as long as you bring it in with the receipt. Still a hassle though, but it has gotten me some gift cards or discounts for the trouble too.

I can't think of any recurring events really. I put things in safe places and then forget about where that safe place is. I keep meaning to find just ONE safe place ad put everything in that one place but I never seem to get around to it.