This adorably strange clip was posted over a month ago by Man Bear Pig, but has online exploded online today, appearing on UpRoxx, , PopWatch, and Metro

The clip features a class of Japanese school children singing the song Day Man from the popular show, It’s Always Sunny In Philadelphia.

Why they are singing the adult-themed song, and why there is a picture of Peter Griffin behind them remains a mystery. 

The video has instantly amassed over a quarter million views in just one day.