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.

* ''Manga/ZatchBell'': Folgore's first appearance. Kiyomaro is still analyzing him while he dances, and Gash couldn't help but join the dance.

* Occurs in ''RockyHorrorPictureShow'' 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 CrowdSong before realizing what he's doing.
* ''Film/TheMask'', with all the cops joining in. Subverted, 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 ''{{Disney/Aladdin}}''.
* In ''Film/HowTheGrinchStoleChristmas'', the Grinch is displeased to find his faithful dog Max dancing along with the citizens of Whoville's song.

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* TV's Frank does this numerous times on ''{{Mystery Science Theater 3000}}''.

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* Wrestling/BethPhoenix sighed at Wrestling/JillianHall's "[[HollywoodToneDeaf performance]]" of Beyonce's "Single Ladies" on Monday Night Raw only to give [[DeathGlare an even more disapproving glare]] to [[Wrestling/KatarinaWaters Katie Lea Burchill]], who she noticed was dancing along to it. Katie quickly cut it out.

* ''WesternAnimation/TheSpongebobSquarepantsMovie'' involves this and a mosh pit.
* In ''WesternAnimation/TheSimpsons'' episode "Lisa the Vegetarian", Homer responds to [[ExactlyWhatItSaysOnTheTin 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 "[[Disney/BeautyAndTheBeast 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 UsefulNotes/{{Bollywood}} song and dance, Smithers looks on eagerly until Burns allows him to join in.
* Max in ''WesternAnimation/CatsDontDance''.
* Occurs in ''Disney/TheGreatMouseDetective'' 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.