It's Always Sunny in Philadelphia

@IUrbanSpaceman:
I'll add some details if you don't mind.
That's right, the dance symbolizes the Poppy's lifelong relationship with religion. In the first part, the angel restricts his movements and painfully intercepts Mac at chest level, no matter how much Mac wants to, he cannot shake off this grip, and he has suffering on his face - this is his whole life before the fire, when Mac felt guilty and ashamed for his homosexuality because of the interpretation of religion to which which he had been taught since childhood, but he could neither renounce his faith nor plead for homosexuality.
When Luther leaves, Mac pushes the angel away, and while she lies on the ground, he sits with his back to her and cries (which is hardly part of the performance, unfortunately, he was just crying because his father had already completely pushed him away, despite all Mac's attempts to establish a relationship), so, with his back to the angel - this is a fireplace in season 11, where he believed that if God existed, he would not have made Mac gay, i.e. if Mac is gay, then there is no god. Then Mac tried to exclude faith from his life in order to accept his homosexuality completely.
But then the angel lifts Mac off his lap and they continue dancing: then he realizes that his whole value as a person does not revolve around his father's approval, he can be whatever he wants. Further dancing along the rhythmic pattern becomes tougher and more dynamic, because even after accepting religion back into his life, Mac still cannot definitively decide how he feels about God - he either pushes away or attracts the angel. But at the final support, where Mac lifts the angel over his head, he attains harmony with faith: religion does not restrict his movements or pin him to the ground, and then the angel comforts Mac in his arms - this is how he receives acceptance from God, with whom he has been passively and aggressively fighting all his life.
There is also a very important part in the fact that Luther had to "understand" the dance, who got off in the middle, and Frank, the hero, understood it as a result, who in the middle of the 11th season (the Being Frank series) did not want Mac to even touch him, and in this episode threw him back. for his own selfish gain (the only thing that none of the gang almost ever discards), he did not drag Mac to the Pride, where he would not have been comfortable yet, sincerely tried to help and "understood" this performance - so Mac, mb, did not receive the acceptance of a biological father, but Frank acts as a positive here father figures for Mac.

@Viewtiful: In the middle of the episode, Mac tried to explain it all: "There's a storm raging inside me, God sends an angel in the form of a hot chick, we dance and something beautiful is born."
It has already been jokingly mentioned in the series that it is difficult for Mac to be Catholic and gay at the same time, because "they are kind of at odds." Most likely, this is exactly what the storm inside the Poppy is. Even Frank says in this episode: "The Catholics have seriously messed you up."
Towards the end of the dance, after Mac's father has left, Mac strikes a pose as if crying, and the angel girl hugs him and repeats "everything is fine", after which they will be illuminated by light from heaven - most likely, it is implied that God accepts Mac.
And finally, "something good is born" is the rebirth of Mac himself, since God has accepted him, it means that he can accept himself as gay and as a Catholic.
Of course, I'm not 100% sure that's what the authors meant, but that's how I understood it.

The man from the bus has already appeared in the series before - 4x06. And then he was breathing and staring at Dee, and again on the bus! It's cool that after 10 seasons they managed to repeat the joke with the same character: Oh

I expected a lot from Philadelphia, but not this absolutely gorgeous tear-jerking dance scene.. wow

- There are two gay men in this church!
"Who's the other one?"