NMNYO: Can we at least lay down a blue tarp?! Mom, this is insane. The floors are going to get scuffed!!!!
During party, as a couple dozen middle aged people joyfully dance and celebrate:
Later on, pretending to be nice to the birthday girl...
NMNYO: Happy birthday! (inwardly: you thoughtless fucking floor scratcher!!! You've taken advantage of my parents and our family room!)
Afterward, assessing the damage...
NMNYO: Look at those scratches, dad. I warned you!