Christmas (music) in July

One of the Western-style supermarkets (I use this term loosely) plays American pop music- or at least American pop music covers by Asian artists. 

They play a LOT of Ke$ha. 

Yesterday, they played Mariah Carey's 'All I Want For Christmas'. The employees had no idea why we were laughing... 

Or why Nick was making this face:

He really really likes Christmas music.