If you're really in Beast Mode, In-N-Out lets you order your burger with up to FOUR patties and FOUR pieces of cheese with its 4x4. There was a time when you could add five, or six, or 100 patties, but someone ruined it for everyone by actually ordering a 100x100, forcing In-N-Out an official limit of four. Sure you can order an unlimited amount of 4x4s and create a super burger, but don't be a dick. The 100x100 has already been done and documented (See photo below). All you'd be doing is slowing down a line that's already going to be incredibly long.