Overview
The Farm mission has an alternate ending.
Farm alt ending
When you have fed all the poison chickens to Karen then pick them up in the wheelbarrow and take them to the box in the graveyard.
Now grab your frying pan and smack that chicken (mini boss spawns).
Fight the boss and wait around the van.
Congrats you’ve found the alt ending!
Takes a little more time than the main ending but it was fun for my friends and I in CO-OP mode.