Instant Regret

I'm working with the anti-theft sensors they put on clothes today. They consist of a piece that looks like a giant thumbtack that pierces the fabric, and a piece that then fits over the end of the pin part, locking it in place until it is removed with a powerful magnet by a bored cashier making minimum wage.

I'm trying to be efficient, so I pick up a huge handful of the thumbtack parts, only to realize as I'm doing so that something designed to pierce fabric is also, inadvertently, designed to pierce skin. 

I immediately regret picking up this handful of plastic cactus as one of the sharp points stabs my knuckle and another slips underneath my fingernail, and voice my regret with the universal signifyer, "Ow!"