Believe me, I love it in videos when guys scream when they cum. Once, when I snooped around in my older brother's collection of burned/copied DVDs, I ran upon this hetero one, where the girls gave the guys head.
This one scene was so hot. Right as the guy is about to cum, he like begs her to stop and slow down, and she just keeps on jacking him off and sucking him. OMG, I can still hear his yell when he came. Awesome.
Yeah, if anyone has vids of guys screaming, please post.