Any of [Grant Howitt's single-page RPGs](https://feddit.uk/post/2383372), great if you just need something fun at short notice

Honey Heist is my fav out of them, though the one with gay orcs is something I’ve wanted to run for a while

Wild Sheep Chase is a great one for introducing people into D&D. A very silly one shot. It's first combat is quite difficult though and tends to blow out the timings when there are first time players.