you said the rhyme you did the crime
The one and only appropriate response to the age old saying "you smelt it you dealt it" thus pinning the flatulence back on the gentleman whom is most likely responsible.
*gentleman 2 farts in the elevator*
gentleman 1: Oh my god that smells disgusting! Taco Bell again for lunch?
gentleman 2: Dude...you smelt it you dealt it
gentleman 1: On the contrary, you said the rhyme you did the crime
gentleman 2: You reversed the charge so your at large!
gentleman 1: umm no...that is a stupid one
gentleman 2: damn ok you got me
gentleman 1: Oh my god that smells disgusting! Taco Bell again for lunch?
gentleman 2: Dude...you smelt it you dealt it
gentleman 1: On the contrary, you said the rhyme you did the crime
gentleman 2: You reversed the charge so your at large!
gentleman 1: umm no...that is a stupid one
gentleman 2: damn ok you got me