If you really wanna know, just ask....
Lmao - this has to be the funniest Easter Egg yet!
Act 4 - Chapter 1 - Insane Difficulty. Make it through to the secret armoury without destroying any of the ash people. When you are in the armoury, kill the chicken with the hat on (yes, seriously!). Then in Chapter 2, you need to find the three trick ammo boxes: the first one is on the bonnet of a car near the edge, the second is at the end of the tunnel with the broken train tracks and the third is balanced on top of a pile of crates in Chapter 3 (just keep looking up and you'll find it) - when you kick the crates, it topples of the cliff....then get ready for a quality scene - it really is worth the effort!
It only works on Insane - and you get the cluckshot too!!