it's a cake with big teeth
(
You drive like a mong in a dodgem today is,
Sat 29 May 2004, 16:06,
archived)
The scene in
Crocodile Dundee where the chap pulls a knife on Paul Hogan and he pulls out a much bigger one and says 'Now that's knife.'
(
Small Beer,
Sat 29 May 2004, 16:08,
archived)