Ok, I'll be the oddball here. I don't scream on thrill rides and I hate when others do, especially if they are seated next to or behind me. I want to enjoy the ride, not be deafened by others screaming in my ear. I don't mind a "Yeah" or a "Woo-hoo." I'm only talking about outright top-of-the-lungs screaming. Enjoy the ride, but let everyone else enjoy it too.