I sometimes get people telling me that my campaigns are too easy or they are set up to make the players too powerful.
I often give players the ability to reroll their stats multiple times, and the option to change any negative modifiers to 0 by increasing that stat to 10. I've had many players tell me that such is not how you're supposed to play.
Here's the thing though, I have horrid luck. I don't care if you don't believe in such things, I don't need you to believe when I have on multiple occasions, flipped a coin and called it wrong 58 out of 60 times, and that was to PROVE to someone else I had bad luck.
Every once and a while I take these super under powered characters and throw them into a quick easy game, kinda like an arena combat situation but I put them against a stupid weak foe.
I remember, this one guy was really proud of his Warlock who had absolute crap AC as he had a negative dex modifier and he "didn't need DM help to make an awesome character"
So I put him in an arena with… a CR 1/8 Pony and told him to roll for initiative. He rolled significantly lower than the pony. But he still laughed that I was throwing a pony at his warlock who served the darkest of dark gods.
First move, I rolled a 6 on the D20, plus 4 for the pony's attack. Out did his AC by 1. Rolled damage, 2d4+2 max damage of 10.
"You are dead, start rolling death saves."
First death save fails, pony isn't done, it stomps on him killing him forever.
After his tantrum at being one shotted by a CR 1/8th pony I told him to redo his stats and he finally did.
Please note, I did not fudge any rolls at all.
I have had this sort of nonsense happen so often that I full on expect it to happen every time.
I remember one of the games I played way back in the navy. I don't remember all the details other than the rolling. Me and three others started, not in a tavern but already on a mission as a scouting detachment for an army or something, I think we were supposed to get lost and find some ancient power or something as the story line. But first we ran into a small group of goblins.
Four of us total, six goblins. Not terribly hard, especially since I know we had at least one person with burning hands or some sort of AOE spell.
We did terrible with our imitative, and it is important to explain that our DM was kinda rough and used the crit fail/success system meaning, if you rolled a 1 on the attack, you effectively attacked yourself.
Two of us went first, rolling natural ones. Attacking ourselves. Our DM explained that the goblins weren't very smart but they appeared to have some tactics, so they threw themselves at us at least semi logically, two for the melee experts, and one each for the casters if I remember correctly. Long story short…. 5 natural 20s and the before half the party even got a single turn in the entire campaign, total party wipe.
Still to this day… I refuse to allow my players to have negative modifiers or ACs below 15 Because I know they will die extremely quickly. It's not a "chance" of it happening, it's a full blown guarantee.