David Tennant tells a Knock Knock joke. David Tennant tells a Knock Knock joke when hosting a Dr. Who themed "Never Mind the Buzzcocks" episode. Cathe dr who David Tennant buzzcocks knock knock Never Mind the B Wilfred Mott
"This is my timey-wimey detector. It goes ding when there’s stuff. Also, it can boil an egg at 30 paces, whether you want it to or not, actually, so I’ve learned to stay away from hens. It’s not pretty when they blow." Aaaaand Martha's face is priceless.