It's Always Sunny In Philadelphia Season 12: 10 Funniest Moments

In The Gang Turns Black, Charlie, Mac and Dennis land themselves in hot water with the law when trying to get into Dennis' car after switching bodies with African-American males. At the police station, Charlie is given a separate interview room to speak with a social worker, as the person he had switched with was a young child. Charlie then breaks into song while playing with a toy train, and begins to sing about his life.

What we get next is a brilliant use of dramatic irony that is both incredibly humorous and slightly uncomfortable.

He details his daily life of working at a bar, where he cleans the toilets and gets drunk; as well as the fact that he shares a bed with an old man (Frank) and his mother's past as an escort. All the while, Charlie continues to play with the train.

You'll get a decent laugh as the social worker looks on in shock as Charlie goes on, believing him to be a pre-pubescent African-American boy, and not a middle-aged white man. This is made even funnier by the police officers in attendance looking at each other in sheer confusion, which is only amplified when Charlie begins to speak to his doppelganger in the mirror.

All things considered, this was arguably the best moment of the season premier.