Heating my mash tun (plastic cooler) with some boiling water. Time to pour out the still 200°+ water before mashing in and decided to tip the cooler onto its side instead of tossing the water down the driveway. I was wearing sandals.
A significant portion of the water splashed to the side of the cooler, right on one of my feet. Thankfully I only suffered some minor reddening of the skin and a little tenderness.
DON'T DO THAT.
That must have hurt. To save water (and skin) another option is to overheat your strike water and leave it in the mash tun instead of using a separate kettle of water to pre-heat.