Since when do Pineapples grow in the Tube

This is the weirdest litter I've seen so far in London.. it's true I've been on the bin-quest too around town several times, and there are no bins here to be found.. But why would you want to get ride of the pineapple leaves when your in the Tube?

It really reminded me of the guy in Sex and The City who brought a pineapple to jury-duty in his suitcase.. (for the die-hard satc-fans among us)