PlotSheldon vows to pull a prank on Howard. Meanwhile, Leonard must resist temptation from an attractive woman in order to stay loyal to Priya.
- Absence Makes the Heart Go Yonder: Leonard agonizes about cheating on Priya while she's abroad. Then he finds out Priya had been cheating on him multiple times and has no shame about it. This is when he breaks up with her.
- Electric Joy Buzzer: Sheldon rigs one to get Howard, but when he does, Howard appears to have a heart attack. It turns out to be another prank, and Sheldon does a Face Palm at falling for it... shocking himself in the process.
- Fainting: Sheldon when he's scared by Leonard in a mask. The guys apparently were making bets on whether he would.Howard: Who had money on faints?
Raj: I had peed his pants.
Leonard: Hang on. Looks like everyone's a winner!
- Halloween Episode: Sheldon is the victim of a Halloween prank, and spends the rest of the episode trying to get his friends back.
- Kick the Dog: Subverted: While Priya cheating on Leonard with her ex might seem like a massive dick move, it was most likely done by the writers to get him and Penny back together, rather than any cruelty on her part.
- Mood Whiplash: Leonard had broken up with Priya for cheating on him and had lost Alice after he told her about Priya. Now all alone, he sits on the couch... and is spooked by Sheldon suddenly emerging from under the cushions in zombie makeup.Sheldon: Bazinga, punk! Now we're even.
- Shot to the Heart: Shocking Howard causes him to go into cardiac arrest, and the only way to save him is for Sheldon to give him a shot of adrenaline straight to the heart. Fortunately, it was just a prank on Sheldon.