“Te falta una patata para el kilo” (in Spanish)
English: “You’re missing one potato for the kilo.”
When you want to call someone a fool or an idiot, you question if they’re in their right mind, if they use their head before speaking or doing something.
When I was little, I used to think that before I was born (1977), people and the world in general were in black and white. All the photos I had of my family before my birth were in black and white.