I’m fairly sure this is old news to some (but not to me, darn it!) Tennant pretends to be kidnapped by a crazed fan in order to play a trick on an unsuspecting estate agent:

The best part, of course, is the bit where the less heroic estate agent runs away. He could have at least untied David, eh? I might have been unhelpful myself in that situation. I’d probably be too busy snapping pics with my phone cam and posting them to the ‘net.