The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at the Trope Launch Pad.
Thanks for replying, I can see a connection but it's not quite what I'm looking for.
I think mixing stuff around the house (like bathroom chemicals and toiletries) could be a trope if it isn't already/probably has examples in media, though to what extent of intent (for fun or with an objective to make smth) I have no idea.
Fun will be had | AYAOTD: Carnival of Doom (and Mr. Tophat) is underrated.This breaks down into several parts:
MacGyvering if you know what you're doing and have a goal for it.
Chemistry Can Do Anything: in fiction the exciting
results of mixing random stuff you found under the sink can be downright magical
Homemade Inventions for the budget mad chemist mostly working with stuff they have laying around the house
Accidental Discovery if you make some miraculous compound without intending to like George does
Technicolor Science and Gratuitous Laboratory Flasks for this working best when you use a lot of colorful liquids and elaborate glassware setups.
Edited by Scorpion451

Mixing household chemicals to create some concoction. I thought of "doing it for the fun of it" examples - as in The Fixies' episode "The Toothbrush"
where Tom is pretending to be a mad scientist in the bathroom - but then I remembered George's Marvellous Medicine, George intended to poison his grandma but accidentally made a functional shrinking serum. I couldn't find a close enough trope on the latter's page, and I feel like this has happened more times than these two examples.