From in-game universe, it is written and directed by Joey Drew.
The beginning shows Bendy walking to Boris' house, going up to the porch and rings the doorbell while waiting for Boris to wake up, but does not seem to wake up at all. He then has an idea of wearing his ghost costume and preparing to scare Boris. The door then opens to reveal Boris wearing the same costume and saying "BOO!". Bendy then runs away and leaves his trick-or-treat basket behind, having Boris to take it in joy.
This is the very first cartoon short where Boris has ever been known to speak.
The title card of the cartoon.
Bendy ringing the bell outside of Boris house.
Bendy ringing the bell second time outside of Boris house.
Bendy discovering Boris is sleeping in his house.
Bendy putting a ghost costume on as an attempt to scare Boris.
Bendy running away after being scared by Boris wearing a ghost costume.