DuckTales, Season 1

Dewey:
[in a room full of golden keys] Oh man! How are we gonna find one gold key in all this? Well, good try everyone. You should head back. Way to go.

Louie:
[popping up from the keys, examining one key] Found it. Real gold weighs more than Fool's gold, so you just search the bottom of the pile. You know, check the luster, and the karat quality, and boom. Pure gold key. [beat] What? You like nerd stuff, I like gold. Come on.