Yep I can but not on command it just happens instinctively. Awhile back a friend of mine jumped out around a corner and scared the crap out of me and I shrieked. And when I'm at a club or watching a show and all the women scream the wooooooooo, I can finally join in on that and it feels GREAT! 4 years of vocal practice has been paying off. Now just have to get my singing voice down.