The mathematical fallacy here is just *chef's kiss* painful. Dividing by zero doesn't give you infinity—it gives mathematicians migraines. It's like saying "if I eat zero cookies but share them with zero friends, each friend gets infinite cookies!" Sure, and I'm getting tenure next week.
The couple's body language perfectly captures that moment when your partner drops mathematical nonsense at 2 AM and expects you to be impressed. Her face screams "I'm dating someone who thinks division by zero is a valid financial strategy."