This reminds me of a skill that one of my Brother-in-laws was so proud of. His ability to pour a shot-glass of tequila to overflow without spilling a drop, or even a micro-drop. He loved to demonstrate; yes, you can overfill without spilling thanks to the cohesive molecules that hold together before surrendering to gravity. If you stop pouring at a precise instant there will be a slight bulge at the surface, which can be observed by laying the side of one's head on the bar surface and you can actually see the the bulge or crown that rises slightly above the rim of the shot glass.
But that was only half of the skill.
The other half was to chug it without spilling a drop. While he almost always succeeded in accomplishing the first, this second skill was more hit-or-miss, mostly miss. But he always gave it 4 or 5 attempts before his wife made him quit.