When I was 12, I remember clearly flying LAX-LHR-JNB (this was back in the day when LHR-JNB on SA was "around the bulge", but LHR was fog-bound. We were diverted to BHX and moved to LHR by coach.

Of course by the time we got to LHR we had missed our flight, which meant an overnight stay in London. Since we then had a few hours to kill the following day, my parents bundled me into a black cab with them, and asked the driver to "show me the sights".

It became my own personal tour - without stopping anywhere of course. It was a looooong time ago so I don't remember all the details, but we must have been in the cab for an hour or so. Would have cost the earth, but for a 12 year old was very cool

-- Mike