me_irl

When I worked at Taco Bell, I would make food like how I would want it and I would ice and fill drinks how I'd want it: just enough ice and filled to the brim with no overflow or mess. The trick is to tilt the cup and overfill it, so that the foam rolls out of the cup as you're filling it, then untip it as you top it off. The momentum of the overflow keeps the side clean if you do it right, kind the same energy as snapping off a paper towel or toilet paper from a roll one-handed.