Why do Tube strikes always coincide with football matches?

[longfingernails]

Surprise surprise, Mr Crow has decided to call a strike

www.thisislondon.co.uk/standard/article-23841880-tube-staff-vote-for-strikes.do

I can't be sure, but I vaguely remember some sort of minor football related event coming up soon?

The RMT must be smashed. It makes every Londoner's life a misery.

Bet they can't wait for the Olympics!

They could strike over every driver wanting to have a nubile young woman (or man) to feed them grapes while they work and they'd probably get it in 2012 so we can keep the tubes running ;)