Been using chalk now for about a year. I keep it in a sealed rubber maid container, with the lead secured usually between lifts.
Anyways... I was changing the plateson the bar. Tossed a plate aside and nailed the chalk container. And you guessed it. The lid wasn't on. #$%#$%@$% chalk dust all over the place. Luckily no one saw it.
I knew it was eventually gonna happen.