RPGMemes

It’s the second shittiest common house rule, assuming you mean that if someone with a +15 bonus rolls a nat 1 on a DC 5 check, they automatically fail (possibly with a worse effect than if someone with a -1 rolled a 2).

On the other hand, there are other ways to have crit fails on skill checks that are much more palatable, like:

• having a slightly worse effect when someone rolls a nat 1 and would have failed anyway
• having a worse effect when someone’s total is 1 or lower
• having a worse effect when rolls are failed by certain thresholds, like by 10 or more (potentially, but not necessarily, only when the roll was a nat 1)

(The worst common house rule, btw, is crit miss tables for additional effects beyond an automatic miss when you roll a 1 on an attack roll.)