Two characters who have been bickering or avoiding each other all season are trapped together (in an elevator, a supply closet, or a stalled car). The tension finally snaps, leading to a long-awaited "will-they-won't-they" moment that complicates everything for the finale.
"You were never going to tell me, were you?" Character B: "I was trying to protect you." Character A: "No. You were protecting yourself. There’s a difference." Marketing Teaser (Social Media) [S1E20] Episode #1.20
Since "Episode #1.20" is a generic title used for the 20th episode of a first season, this content can be adapted to fit almost any drama or sitcom. Two characters who have been bickering or avoiding
"Everything they’ve built is about to come crashing down. 🏛️ Don't miss the penultimate episode of the season. Once the truth is out, there's no going back. #Episode120 #Season1 #ThePointOfNoReturn" You were protecting yourself
The gala is in full swing. Just as a toast is being made, a character looks at their phone or across the room and realizes they’ve been set up. The screen cuts to black just as the first domino falls.
A minor character from earlier in the season reappears with a piece of evidence or a warning that changes the context of the entire season’s mystery. The Cliffhanger
The episode centers around a major community event (a gala, a championship game, or a wedding). This provides a "ticking clock" and a reason for all the main characters—even the ones who aren't speaking—to be in the same room.