In the first night the guy on the phone also known as phone guy mentions "THE BITE OF 87" one of the anamatronics Violently bit someone possibly a costumer but the one who did it is unknown it resulted in parcel lose of the persons brain. However most people think it could be foxy because his jaw is broken and his sharp teeth and also his large mouth.
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10 facts about five nights at Freddys
Mystery / ThrillerAll about the secrets of the scary game five nights at Freddy's