(1) I'm going to loudly shame everyone for this thread causing me to repeatedly spill my morning tea while reading this thread

​​​​​​​(2) I'm usually politely invited by security staff to pass through the arch when my trays haven't even started moving, and equally politely I inform the staff that I'd prefer to wait for my trays moving to the point where phone, wallet & co. are unlikely to 'fly' to someone else's tray while I'm not watching. Never been an issue.