Filthy Commuting Scum

Well, here we go. I get on my train to go home and what greets me? Is it:

1. A person from the train company to wish me well on my fun-packed journey home?
   
2. An evil-smelling tramp reeking of piss?
3. A clean carriage and comfortable seats?
4. What appears to be the aftermath of a food fight between filthy commuting scum?

Hmm. Could be any of those 4, couldn't it?

Let's have a guess using this photo below:




Yes, it is number 4, possibly with a bit of number 2 too! Notice the discarded sandwich boxes (one stuffed under the seat and one left on the "little table thingy"). Also notice the coffee cups too. And, of course, the very sticky floor. The seats are probably wet too.

So what sort of individual would do that, when there's a bin about an arm's stretch away?