I bought a new litter box for the cats yesterday, and when I filled it with litter, I was too lazy to put the lid back on.
Today, as Jess walks past the litter container she notices something odd. Apparently, one of the cats had to go, and couldn’t quite make it to the bathroom where their litter box is. So, as an alternative, they jumped into the litter container and went in there.
You can’t really punish them for that.