What’s the dumbest way you nuked an edge play?

I'll start had a +EV promo on discord odds boost with a clear 10% edge which should’ve been free money. Instead of placing $5 like I thought I did I fat fingered and slammed $50. On a line that moved minutes later sweated the whole game like it was my mortgage payment. It cashed but my soul left my body for a full two hours.

Now I wanna know what’s your most avoidable L on a +EV play? Misread the terms? Wrong book? Took a leg off a parlay by accident? Trying to feel less alone here lol.