It's always us experienced guys, we think we know it all.
Decided to spend some of the isolation casting. I sometimes use old cast boolits that I'm NOT going to load and shoot to flux the pot. The lube serves as a little flux and you reclaim the lead. I've been doing it for years.
Anyhow, I dropped one in the pot (Lee 20# bottom pour) and started to stir when POOF the fumes ignited. I often light the fumes, but I've never had one just go spontaneously. Well, it startled me and I jerked, pulling a spoon of alloy out. It splashed all over, including a few spots on my pants. Fortunately I was able to pull the fabric away fast, and most of it was on vertical surfaces, so I was OK. I do have 1 patch about the size of a half dollar right on the top of my left thigh, and a tiny one inside the right thigh.
So be alert! You really can be taken by surprise and you really don't know it all, regardless of years spent casting.
Here's what the fairy left me
Be careful!