Dumb dnd story

So i'm the forever dm in my friend group and we already did 2 campaigns, each campaign ended with the bbeg charging an final attack to destroy everyone, however both times i rolled a natural 1 causing the attack to hit the bbeg, i did not rig this at all, and the odds of this happening are 0.25%, so whats your dumb storys? (Can be from dnd or something else)