Whats funny is...
...I actually did that once.
'Knock knock!'
'What?'
'WHO'S THERE!!'
(
Garcia,
Mon 8 Nov 2004, 19:29,
archived)
it's even better
to get someone else to say 'Knock Knock', then you say 'Who's there?' and watch them try and work what they should say next.
Oh the fun we've had with that*
*remembers not much fun
(
Griffin Saver Something, something, 2006, something.,
Tue 9 Nov 2004, 10:01,
archived)