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I tend to have one or both of my daughters with me if i'm in a queuing situation, and therefore have a backpack on (nappies, snacks, my little ponies that absolutely had to come to the post office with us). It might be that I suddenly need something from it, so take it off in an exaggerated, swinging manner that might accidentally clout someone who happens to be right up in my personal space.
People who stand unnecessarily close to you in queues.
Turned to leave the counter after dropping parcels off at the post office and pretty much went straight in to some creepy dude who’d been right there all up in my anti-grill.