Just played night 2 and haven't really seen anyone talk about it yet so spoilers if you haven't played it yet.
Seems like the story is that back in '69, Harry must have been getting a blowjob from Golden Frenni, but I bet she was as crazy as she is now back when she was alive, so she shoved a finger up his bum without any warning. He ended up cumming so hard her head popped off and he fell into depression. Harry left the store to hide in his mansion, and his secretary/admin assistant Phone Guy ended up having to take over to keep the place running. He was never intended to run the place and as we see he does a shit job. Golden Frenni's ghost keeps infecting all the other robots with her brand of crazy/horny and we end up in the current situation. Also Purple Guy might be Harry.