Remember that song from 2013
Ylvis - The Fox (What Does The Fox Say?)??

Is Foxy's Dum Dum Dum (Five Nights at Freddy's)
sounds kinda like that singing Fox at the end? O.o

Imagine Foxy would go like that...
when you play near him that song
... or something like that :D

Just saying...

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The resources:

Foxy in the curtain image, Sound Dum Dum Dum and
Ylvis video fragment from the official video for the video purpose.