How many Green Party members does it take to change a lightbulb? Answer, one: they don't like to share the spotlight.

How many Green Party members does it take to change a lightbulb? Answer, six: One to change the lightbulb, and all six to deny ever having supported the changing of lightbulbs later on if the policy becomes unworkable because of political expediency.

How many Green Party members does it take to change a lightbulb? Answer, 50: one to change the lightbulb and the other 49 to go shopping for polenta and fresh parmesan in the Prius.

How many Green Party members does it take to change a lightbulb? Answer, 100: one to change the lightbulb and 99 to say nothing about the mountains of obsolete light fittings that will now have to be dumped in landfill sites.

Sorry, I should have warned you those weren't going to be funny.