Here's a poser for you. I'm going on strike at the end of the month, along with millions of public servants whose pensions are being slashed to pay for the bank bailout. As is normal, our pay is docked for that day - about which I won't complain.
However, a few days later, I've been asked to 'volunteer' on a Saturday for a project with which I wholeheartedly agree. I'm torn: the 'Saturday University taster' is a great idea, and I'm friends with the originator, so I don't want to be churlish. On the other hand: if they don't pay us when we don't work, shouldn't they pay us when we do turn up? There's very little goodwill left in this place - I don't want to erode what remains, but nor do I want to let my employers think that they can make money by exploiting our kindness.
So: do I volunteer or stay away?