It's pretty much a given that any longtime commuter is psychologically disturbed. They're plugged into the rail network and everything else in their lives becomes secondary. See them come off the trains in Sussex marching at twice the speed of anybody who spent the day in Sussex. Its a form of...
Guaranteed the shitty little case, that probably weighs less than a bag of sugar, has wheels, a two foot long extendable handle and a noise level of about 130 decibels when pulled along the street.
I feel really sorry sometimes for the innocent infrequent traveller/tourist on our rail network who happens to inadvertently fall foul of the twitching ball of neurosis that is a Metro-reading rush hour lifer commuter. Poor devil's got no chance against such thinly-veiled psychotic venom.