"Q: How many university" joke

Q: How many university students does it take to change a lightbulb?
A: 31. Ten to vote on whether the light bulb needs changing, whether they should join the Lightbulbs Union first and then what to call the new lightbulb - (the Nelson Mandela lightbulb ?), one to put it in... and twenty to have a pissup after to celebrate a good days work...