First of all,THERE IS MORE THAN ONE ANIMATRONIC. Welp, should have knew it from the start. Next, there's a certain area where you can hear Balloon Boy's laugh. The first night go without any issues. Then, all of a sudden, cue the Atari style mini-game- *Cue a big noise from the game in the video*OH SHIT WHUT WAS THAT?! *Heart jumping some beats* Ugh....Anyways, when he beat the first night, there was suddenly the Atari style mini-game! You had to follow someone....It was the purple man. You play as Freddy in it. When you finally made it, he then....took apart Freddy. Then....there was a silver/grey thing flying straight to the purple man, and it ended.
Cue the second night. *Hears Golden Bonnie/Springtrap/I don't care killing the Player* Welp, that happened. Yeah, that's when the big noise happened. I don't know what it was, I was not watching most of the video cause I am a pussy. (We were watching on our Xbox 360) So....yeah. This is all I got from a video of Five Nights at Freddy's 3. The video in question was by Nate Wants to Battle, BTW.
Check the video out for yourself, if you like.