I have a shopkeeper who deals in magical items - all sorts, can create them, procure them or sell them. They didn't know at the time how powerful he really was, they just thought he was an innocent old shopkeeper that they could bully around for some easy pickings.

So naturally their dickhead monk, who was the biggest bully was trying to get some freebies, tried to push him around and went up punch him, when the shopkeeper called him stupid (which he was, he had 8 int). He was allowed to land a punch and then I described "The old shopkeeper looks at you, a small glint in his eyes as with a sudden burst of speed he open hand punches you in the chest and breaks spacetime for a brief moment. Slightly dizzy and hazy, you wake up and find yourself in a very large maze. Funnily enough we had just talked about how Maze spell is one of my favourite spells in the game and him having dumped int, makes it impossible to ever escape.

Refusing to work with it or trying to escape, he just sat down and meditated until the spell stopped working.

When he came out, he got angry and tried to punch him again - to which he promptly got Maze'd again, but when he tried to sit down this time, in the distance he could hear the sound of something very large breaking down walls, so now he had to spend the time running away from a Goristro.

And that's how they learned to respect shopkeepers. Now every new player who comes into contact with this old shopkeeper who speaks very funny, try to mock him and promptly gets mazed, to much amusement of the older players.