I think a while back there was a version of the TV game show "Jeopardy"
sold for home use that included a sensor w/suction cup to be put in the
lower right corner of the TV screen.  You could then play along with the
Real People on TV.

I'm a little confused on the details because since then, I took my TV set
apart to power the filament on the new PIC on the way:
http://alpage.ath.cx/superpic.htm

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