Zoidberg: Quiet, please. I've called you all here to the parlour to watch as I gradually solve the crime. One of the people in this room... is a big murderer! You see, the killer left one fatal clue: This boot print on the Professor's lab coat.
Leela: Uh, couldn't be me. I never wear boots. (She unzips her boots and lifts her feet onto the table) See?
Fry: Ew! What smells like boot feet?