In college I was taking a turkey in a roasting pan to a pot luck dinner and some of the drippings sloshed out into the passenger side foot well. Soaked into the carpeting and the foam pad in the corner - smelled like something rotting in there for weeks
Nothing major in the M3 - some coffee, but with weather tech mats it wasn’t hard to wipe up and the tray style of the mat meant it didn’t leak all over the carpet.