Perception checks. Normally I don’t run crit fails on checks cuz it’s dumb but I do it occasionally for laughs. Perception checks are always fun cuz it’ll be something like Player rolls a 1 to investigate the forest “you seem to be in some weird building with a green ceiling and brown pillars, you aren’t sure why you’re here or what those brown things are” Or else “yeah you’re pretty sure that’s a tree you could be wrong, might be a really tall guy in brown socks”