Does Anyone Knows how to this or this is weird

I downloaded this model and when i open i kinda say wow so i contacted the owner of this model Randy Wetzler to asked how did he do it and he says "(wow, I have no idea where that came from. maybe hacked the files or something, weird. That's crazy)"

Does anybody knows how to do it

This is the video i uploaded in youtube
https://www.youtube.com/watch?v=bud5R4QR328&feature=youtu.be

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