Your acceleration tilts the tray. Ease into motion, ease out of it. Slamming to a stop throws everything forward.

Turning spins the tray. Tight corners sling plates off the outside edge. Take them wide.

Hold SPACE / the STEADY pad to kill the wobble — but you crawl while you do it. Every second costs tip.

Liquid keeps swinging after you stop. A full glass has almost no freeboard. Spills stain shirts and puddle the floor.

Bumping a guest jolts the tray hard and sours the whole room. Squeezing past without touching builds STYLE.

Fast + intact + full + unstained = a fat tip. Late, splattered or soaked = pocket change.