Rowdy pupils on the Isle of Wight are being punished by being brought to school on a pink punishment school bus, there is a photo of it in today's Times, but the online story needs a subscription.
So here's another reference I found.
http://www.iwight.gov.uk/home/news/press_details.asp?relID=3033
The bus is the oldest in the bus company's fleet aswell as being pink.
They say pupils hide their faces when travelling on the punishment bus, in my school I would fear it would have been a badge of honour to travel in the vehicle.