Reminds me of the time me and my friends were playing paintball, it's the only time we've ever really had any sort of battlecry. We were pinned down and under heavy fire, outnumbered 3 to 1 by the enemy, who were holding a fort we needed to take. My friend and I were hiding and occasionally popping up to try and shoot, but it wasn't doing anything. We were resigned to defeat, but then my friend starts to mumble something. Slowly, it rises in volume, until I realize that he's chanting "Blood for the Blood God". As it rises in volume, I see him standing up, and something comes over him. I join him in the chanting, and we scream BLOOD FOR THE BLOOD GOD as we rush headlong into the enemy team's fire, our team suddenly bursting from cover, emboldened by our display of faith to Khorne.
We took that fort in honor of the Ruinous Powers, and ever since then, "Blood for the Blood God/For the Emperor!" has been my battlecry.