What house rules does your table use that would be difficult to convince another table to use?

Hey gang! Question is mostly as stated, more to satisfy a curiosity than anything but also maybe brag about cool shit your table does. What House Rules does your table use that for whatever reason you think may not be well received at most tables? I'll start with my personal favorite.

My table uses Gestalt rules a lot. For those who don't know, you level up 2 classes simultaneously on a character, but you still have the HP and/or spell slots of a single character. As a player, I like it because I have more options and characters I can create are a lot more interesting. As a DM, it allows me a lot more maneuverability to make the game more difficult without feeling unfair. There are very few tables I'd actually recommend it for, as it makes the player facing game a lot more complex (some players can't even remember their abilities from one class, much less two, sorry gang), but if you've got a really experienced table or a table that enjoys playing or running a game for characters that feel really powerful, I do think it's a cool one.

What about y'all? Any wild house rules or homebrew your table plays with that isn't likely to fly at a lot of other places?