Why drinks tip on couches
Couch spills are mostly tilt + wobble from cushion compression—then tiny bumps create tipping momentum.
Definition: Drinks tip on couches because cushions deform unevenly, creating tilt and wobble that amplify bumps.
The simple physics
- Cushion compression → base tilt
- Seam geometry → uneven support
- Micro-bumps → tipping momentum
The elite diagnostic
If a method survives the couch seam test, it’s much more likely to work everywhere else on the couch.