Lets see, when i played in 8th grade we did it really unprofessionally.
one time we rolled 2 nat ones in a row on stealth attacks. Another time we just clipped out of bounds by going through a window to escape prison and became multimillionaires.
one time one of the girls playing had their character fake their period which caused the gaurds to turn arround so i picked the locks on the cages and make one of the gaurds sick and then sneak attacked them both.
lets see we killed half a tavern had a giant earthworm eat the tavern and just left.
we made a human bridge
i started with an antimatter rifle once.
i made an arrakokra battlesmith. the idea was to use a cantrip that pulls the opponent to me (15ft range), fly ten feet above them, pull them, cause them to take 10ft fall damage, drop a barrel with water that i used poison spray on (free action), have my nezuko battle dog whos immune to poison in there, reaction cast slow fall on the dog, have the dog attack the enemy who is poisoned and has poison water surrounded by them. i also gave the dog a sling and magic pebbles.
i made a poison dart monk so i could just shoot at people with poison.
my first character was a swashbuckler who could just rizz the enemy to avoid fights.
One time we had some kinda midas touch thingy, so we turned a kings gaurds to gold, made a shield out of it, sold it to the king, and half of us got arrested, the other half became the kings blacksmiths and the campain for the day ended.
one time we kicked a dude in the balls and then i used cold touch (i think whatever the necromancy cantrip was) on them as well.
not my campain but my teacher (the dm) had other students who rolled a natural 20 to get a girl to follow them to a tavern, and rolled another high roll, so the dm struck lightning upon the girl.