See? Nightmares CAN Come True!
That was a little more than 20 years ago, now; but I still remember one clear fear dominating my time, and I thought of it as soon as I saw a pin kit for the first time.
In short: don't drop your pin kit. Don't lift it when it's not latched. And never, EVER buy pins that aren't colour coded.
Still, nice to have my fears confirmed.