So I got this idea for a novel which is an adventure comedy (And maybe it's also a action thriller but I'm not sure yet) meant to parody the video game trope (Though the story itself doesn't actually have anything to do with video games) where the protagonist is given a very simple and short-term task or quest or something but when they are about to do it, they find themselves caught up in something way bigger than they expected or wanted. Some games where this trope happens is the Fallout series and Vampire the Masquerade: Bloodlines. A non gaming example of this trope is the webcomic Homestuck. The premise of my story is that my MC is a just a completely normal guy who lives a mundane life who one day goes to the supermarket to buy some stuff for his mom/lover (I haven't decided yet.) but then finds himself wrapped up in a adventure he would never have seen coming because he went there. However, that's all I have for now. I don't know what exactly the whole adventure is or what the "trigger" is specifically. The story's premising needs some fleshing out so I was wondering if someone here could give me some advice. Thanks.