An Englishman in New England

Every morning, as my train pulls out of the underground station on my way to work, I catch a glimpse of a spiked iron railing a few feet long, upon which are impaled several Dunkin Donuts coffee cups, presumably put there by the drivers as they wait for the lights to change. My bleary eyes just register a lurid flash of white, pink and orange, briefly illuminated by the train's lights, before they recede into the background behind myself and my fellow passengers. Noone else ever seems to watch them pass like I do, and I wonder if anyone else pays attention to what is going on while staring out into the blackness of the Underground.

I've seriously contemplated replacing the cups with severed human heads just to see if I could get a reaction.

An Afterthought: I wonder how long it would take for people to investigate whether or not the heads were real, after casually dismissing them as 'some prank'