Nah, I keep my hands up to show what a big and brave little soldier I am. Let's dig out a few Googled images to show how professional manufacturers test clearance. Now let's get on to the subject of why we put our arms in the air and wave them around like we just don't care. For me, it's showing off. "Look how much I trust this ride and how I'm fearless of anything. I'm well cool." I'm not a scientist. The extent of my biology knowledge is if I drink 10 pints of beer, I'll be sick. So bear with me on the following point. I once read a theory that by putting your arms in the air, you stretch your internal organs and allow more air into your body, which can heighten your senses. To some extent, I believe that. When I'm pumping some Fe at the gyme, the sensation when I extend my arms in preparation to pull the weight bar towards me feels nicer, more exiting, than the sitting in a relaxed position with my arms down. This could be the anticipation of the forthcoming action, which logic also applies perfectly to riding a roller coaster. The inhalation during the action and exhalation as I revert to rest position feels great. Therefore keeping ones arms in a sustained up position on a roller coaster would, I guess, increase lung capacity and heart rate, and give a sexier ride experience. I reckon there is some science behind it. Any goons want to further research this? One of the best head chopper moments I can think of is on Big Dipper at Blackpool. The is a moment just before it returns to the station where it goes under a path. I know it's perfectly safe but I do tend to find my fingers slowly retracting at that moment...and it's the only time they every do. Let's face it, we are not mongs. We're not going to put our arms out/up where there is a potential risk of injury. Not necessarily for our own sake, but to prevent any closures or give tabloids ammunition about "dangerous rides". My days of silly tree grabbing etc are behind me. Must be an old fart thing but this from @Howie, I totally agree with and is my preferred riding style. Finally, from last year, a CF Top 5 Video - the best Headchoppers!