Look out for a full report of the event which is due to be posted on Improv Everywhere's site. You may be pleased to hear that unlike last year they managed to not get arrested as they had a police escort "as if we were a parade". In 2006 a police officer stopped a train at 59th Street, ordered all the pantless commuters off, and handcuffed eight of them on the platform. A judge later threw out the disorderly conduct charges, noting that it was not illegal to wear underwear in public.
The comdedic commuters, or rather agents, start off slowly with just one or two people getting on the train in boxers or shorts. Then gradually more get on so there's about 30 or 40 people sans kecks. I like Agent Isom's video particularly for the bemused & slightly shifty look of the policeman at the end.
The subway fashion victims haven't been let down though, as I was pleased to see one of the agents wearing just a jumper and Uggs.
For more pictures see Chad Nicholson's great Flickr sets and expect to see this on the Tube next year. Although No Pants Tube Ride would have to be translated as something else. Pants doesn't mean trousers or jeans over here and I think it might be illegal to travel without underwear in public. Plus any ride on the Northern Line is generally pants, so that would be too confusing. Any suggestions.......?