Security?
The earlier comment about sometimes having to remove belt or shoes, and next time the reverse happening. This was happening in adjacent queues at LGW My queue had to remove shoes but not belts, the next queue was the opposite. The item on TV where the boffin made a very good bang from two 100ml bottles of something was interesting.
I also likes the driver's comment that he could do a lot more damage with his A/C than with a table knife.