Ted and Marshall take Barney on what turns out to be the worst bachelor party ever, while Robin is stuck at a restaurant eating dinner with his mother.
This episode provides examples of:
- Adam Westing: Ralph Macchio from Karate Kid appears in Barney's Bachelor Party, which Barney gets angry at because he wanted Billy Zabka instead. Turns out they did get Zabka, since the entire time he was the clown.
- Amicable Exes: Played with. Barney is afraid that Quinn is still holding a grudge against him, especially because he got engaged the same year they called off their own engagement. It was all pretend from her, since she gladly accepted Robin's request to prank Barney and appears to be genuinely happy for the both of them.
- Batman Gambit: Robin actually planned Barney's bachelor party to the worst one he ever had as payback for planning The Robin.
- Call-Back: Barney mentions that he sees Johnny Lawrence as the true hero of The Karate Kid. The gang decide to fulfill Barney's wish to met The Karate Kid. Both of them.
- Foreshadowing: The clown can be seen wordlessly mocking Ralph Macchio several times during the episode. This is because he's actually Billy Zabka in a clown costume.
- Humiliation Conga: Barney's wedding started with a crappy motel, his friends got him "the wrong Karate Kid" and a clown, his ex fiancé as the stripper (and denying him the show), he lost the deposit of the wedding while gambling with Chinese mobsters, Marshall was kidnapped and Robin broke the engagement Only to top it with the mobsters chopping off Marshall's hand. However, everything turned out to be a very elaborated prank planned by Robin.
- Sitcom Archnemesis: While Ralph Macchio is a bit of a jerk to Barney, he doesn't do anything to justify Barney's vitriolic hatred towards him, which is a result of Barney believing his character is the bad guy from The Karate Kid.
- Tempting Fate: At the beginning of the night, Barney loudly declares that his life is finally perfect and that will never change. Six hours later, he thinks he has lost everything worth living for.
- Throw the Dog a Bone: While the group intentionally messes up almost everything on Barney's checklist, they actually did get Billy Zabka to show up.