The ABC has a long running TV kids show called Playschool.

I saw this clip on an outtakes show it's famous! The two presenters, a guy and a girl were doing "cars". The guy was wearing a cardboard box around his waist with wheels attached, etc - looked like a car. The lady acquired this large spanner, and stuck her head under the car "to tighten up any loose nuts under there". They had absolutely straight faces, and apparently nobody in the production team realised what it could mean...

Funny the ABC hasn't repeated that epsiode - but then it was back in the early days of Black and White TV.... :-)

Robin