Same exact thing happened to me lol... After suffering through the movie just to please my then-girlfriend, I started howling when that dude hit the propeller... Needless to say, I got the silent treatment for the rest of the night (and multiple death stares from the people sitting around us lol)...
Oh yeah, the death stares from everyone around me. I'm pretty sure my buddy also laughed with me and the death eye daggers we were getting were palpable.