"Um, mom? Why did you just stick sour cream on my nose?"
"It's a really stupid tradition, but most traditions are. My grandmother smeared this crap on my mom's face, and she smeared it on my face, and we all thought it was idiotic but for some reason we keep doing it anyway, so here you go, some sour cream on your nose Because Reasons."
"Um, ok....but the bride and groom smashing cake into each other's faces is a stupid tradition too, but when I got married we didn't do that..."
"I know, and the family is still mumbling about it behind your back. They wonder if you were adopted."
"I wish I was."