“Big Stink”
Sokka: How could something that’s so small you can’t even see it make such a big stink?!
The Mechanist: That’s the solution to our problem!
Sokka: Yeah! If we put a whole mess of rotten eggs in the cellar where the gas seeps up…
The Mechanist: The gas will mix with the smell of rotten eggs…
Sokka: Then if there’s a leak…
The Mechanist: You smell rotten eggs! Then you just follow your nose to the place where the smell is coming from…
Sokka: And plug up the hole where the gas is escaping!
Sokka and The Mechanist: You’re a genius!