Big Damn Heroes: Joey, Tristan, and Tea naturally arrive just in time to save Yugi.
Chekov's Gun: The chain Yugi puts around the Millenium Puzzle at the start of the episode is the only thing that prevents its theft. Of course, it also caused him to be nearly burned alive.
Cool and Unusual Punishment: Marik punishes Bandit Keith's failure to steal the Puzzle by playing the French national anthem inside Keith's head. It's enough to trigger a Freak Out big enough to set the whole factory on fire.
Idiot Ball: Yugi hands his Millenium Puzzle over to a suspicious looking stranger just because he wants to get his fortune read. When characters as ditzy as Bandit Keith and Tea are able to call you out for your stupidity, you know it's bad.
Lame Comeback: The only comeback Yami can come up with in response to being called a slut is to dub Yugi "Smally McSmall".