Are you a fan of Who's Line is it Anyway? - either the Beeb's or the US version, both of which I adore.
The World's Most Dangerous Improv Game from VideoSift
You have to watch it all the way through - there's a bit at the end that's priceless and worth the wait.
And of course, since I went to the BBCAmerica site to get the link, I found myself wandering around and came across a BBC America Dictionary. Now when I'm watching a show I can look up all those words I had no idea what they meant! Whoo Hoo! Plus you can look up insulting words or body parts words just for the heck of it.