I always wanted to make a DND character that's a warrior but was raised with mages so he believed he was a mage. The mages were just too nice to tell him that he was a warrior and kept on encouraging him on his "spells". He would throw a Molotov cocktail and call it fireball and other antics. Sometimes he would get frustrated and punch things and call it mage fist.
Once played a barbarian who told everyone they were a wizard. They practiced time magic, and using their magic staff (great hammer), they took the very years of life away from their victims.
Had a bard companion who would advise people against telling him he's not casting spells, he's just hitting people very hard, as that enrages him and he goes into a "casting rage"
There was a D20Deathmatch where one of the characters was a barbarian who tried to extort a wizzard to make him a wizzard and got cursed into the behaviour you described.
See this little blade comes down slicing the rolled up paper with a rune drawn on it causing it to activate, then that causes the projectile to be pushed down the tube and depending on the rune it can imbue some aspects of the spell to the lead but gold works best for that
Fun History Fact: "Adventurer" means the same thing pmc contractor does.
Mercenary.
I think DnD lost something when this became less known tbh
Now you have tables arguing about whether they're doing a colonialism by burning down orc villages but the answer was SUPPOSED to be "Yes, how much gold did we get?"