Poor Man Rejoice

Finding anything previously misplaced around the house always follows this script:

- Me: "When does a poor man rejoice?"
A rare case where the original expression "Cuando se alegra un pobre?" sounds better and more compact in Spanish than in English.
- Her: "Oh shut up you are not poor.

The expected answer, from my father, is: "When he finds what he lost". 

"A poor man rejoices when he reclaims what he lost" is the best approximation. Though it is not really joy, and what I reclaimed was not exactly lost.

It feels more like a boxer winning a fight. In many ways.