In one round, I did something with a 1/320,000,000 chance, by myself.
I was a level 5 ranger, and at the start of that session we were attacked by bandits during the night. Our Bard who is wielding the enchanted sword we are supposed to be returning is on watch. Well as one of the bandits start slicing into the tent, he wakes my ranger and casts glitter dust out the slice in the tent, my tent by the way. My character, was our damage dealer, you don't want to know about our tank. I had made it so he duel wielded b*****d swords, and had some nice mithral chain. My animal companion is still asleep though. Well I get up and draw my swords while getting ready to fight person outside the tent. I failed on my spot check to notice the halfling bandit leader walk in the entrance of the tent, and coup de grace my animal companion. Poor wolfy went down to -9 hp.So I jump over wolfy, and crit the leader twice, slaughtering him, while the other 4 bandits are coming in through the tent walls.
Next round, while yelling at the druid to heal my wolf, I go to attack the bandit blinded by the glitterdust, through the tent. I roll a 1, so the DM tells be to roll to see if I fumble, I roll another 1, he tells me to roll a luck die and I roll another 1, he then tells be to roll a d%, I roll a 00, and he tells be afterward it required a 23 or under to pass. So then he tells me to roll an attack with the other hand, nat 20, and nat 20 to confirm crit. I'm thankful for healers, because the dm said i made to grab my hand as my +3 defending b*****d sword stuck in the tent, saying my char was forgetting that I had a b*****d in my other hand. So I crit my wrist for 24 damage with my +1 b*****d sword in the other hand.
I later stopped using my dice, and used the person's next to me cause I didn't like the rolls i was getting with that due to 1's and crits.