Oh no... My jokes were a little more subtle...
I still laugh thinking about the people that tried to figure out how they
were getting shocked when they let go of the doornob not when they initially
touched it. It was especially good to watch the person that just got
shocked, when some new person grabs the doornob and just holds it while the
first tries to warn them.
The -ve resistance battery was one such (an empty
battery casing
containing a couple on 9V batteries and a little circuit so the voltage
would rise on load). Drives people mad...
I like that idea.:) look out kids.
The VGA-colour-swapper is another. This is a simple adapter with a DE15
plug on one side and a DE15 socket on the other. All the pins are
straight through, apart from 1,2,3 which are wired 1->2, 2->3, 3->1. The
result is that it swaps the colours round. It's actually a useful piece
of test gear to discover quickly if a missing colour is due to the
monitor or video card. But it's the sort of thing to plug into a luser's
computer after he's spent the morning getting the colours 'right'...
Like swapping red and blue on VAXstations etc.
Dan