I hadn't killed a chicken, and the I learned what happened if you did, so I avoided killing chickens... but then I killed a chicken for lulz to see what happened and it is actually utterly terrifying O_O Getting mobbed by the entirety of Riverwood! One of the few times I've just reloaded, because Alvar killed me, lol.
(First crime I ever committed that I got caugt out for was stealing a book at the College. By accident.)