So there's some sort of fun musical number going on and one character, usually a villain, is not joining in on the fun. They're either watching with a scowl, or have something much more important on their mind. The character looks over to his lackey or partner, only to see them dancing along! Often followed by a sharp glare and the lackey sheepishly stopping.
- Zatch Bell!: Folgore's first appearance. Kiyomaro is still analyzing him while he dances, and Gash couldn't help but join the dance.
- Occurs in Rocky Horror Picture Show when Rocky, as well as all the nameless Transylvanians and Columbia, start dancing along to Eddie singing Hot Patootie much to Frank's dismay/jealousy. Instead of stopping in embarrassment, Rocky gets thrown into the elevator by Frank and watches in horror as he kills Eddie with a pick axe.
- The finale of the movie remake of Hairspray does this with Velma and Amber.
- In Enchanted, Robert catches himself bobbing along with Giselle's Crowd Song before realizing what he's doing.
- The Mask, with all the cops joining in. Invoked, too, when the lieutenant in charge tells his subordinate: "You start dancing, I'll blow your brains out."
- In Anchorman, Brick begins joining in with a rival news team in laughing at his friends.
- Iago in Aladdin during "Prince Ali."
- In How the Grinch Stole Christmas!, the Grinch is displeased to find his faithful dog Max dancing along with the citizens of Whoville's song.
- TV's Frank does this numerous times on Mystery Science Theater 3000.
- Beth Phoenix sighed at Jillian Hall's "performance" of Beyonce's "Single Ladies" on Monday Night Raw only to give an even more disapproving glare to Katie Lea Burchill, who she noticed was dancing along to it. Katie quickly cut it out.
- The SpongeBob SquarePants Movie involves this and a mosh pit.
- In The Simpsons episode "Lisa the Vegetarian", Homer responds to Lisa's new vegetarianism with "You don't win friends with salad!", which Bart turns into a conga line. They leave the frame and when they return, Marge has joined in; Lisa admonishes her, and Marge responds "Sorry, it was catchy".
- Something similar happens in "Two Dozen and One Greyhounds". Mr. Burns sings a song (to the tune of "Be My Guest") where he details how he plans on skinning the greyhounds he adopted from the Simpsons to make a tuxedo. Lisa is horrified, but Bart is humming along, and again, when Lisa calls him on it, he says "You've gotta admit, it was catchy."
- Inverted somewhat in Kiss Kiss Bang Bangalore. When the Indian employees and some other characters break out into a Bollywood song and dance, Smithers looks on eagerly until Burns allows him to join in.
- Max in Cats Don't Dance.
- Occurs in The Great Mouse Detective during the mouse burlesque show, with Basil looking over to see Dawson (who's acting loopy after drinking a drugged beer) dancing with the showgirls.