On last night's season finale of It's Always Sunny in Philadelphia, Charlie wrote a musical, The Nightman Cometh, based on two songs he wrote last season - "Nightman" and "Dayman" - that demonstrate the inner workings of his mind and his subconscious obsession with being anally raped. The musical was a continuation on that, with accidental themes of child molestation and slavery. His whole point for writing the musical was to get the coffee shop waitress he stalks to marry him, but obviously, she was even more creeped out by him than ever before. Clip above.