And then there's the person sitting behind you, tapping his foot on the back leg of your seat, or the crossbar of the legs, or whatever...

Had I had guns (as I had goods) to work my Christian harm,
I had run him up from his quarter-deck to trade with his own yard-arm;
I had nailed his ears to my capstan-head, and ripped them off with a saw,
And soused them in the bilgewater, and served them to him raw;
I had flung him blind in a rudderless boat to rot in the rocking dark,
I had towed him aft of his own craft, a bait for his brother shark;
I had lapped him round with cocoa husk, and drenched him with the oil,
And lashed him fast to his own mast to blaze above my spoil;
I had stripped his hide for my hammock-side, and tasselled his beard i' the mesh,
And spitted his crew on the live bamboo that grows through the gangrened flesh;
I had hove him down by the mangroves brown, where the mud-reef sucks and draws,
Moored by the heel to his own keel to wait for the land-crab's claws!

Peter