Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
On the one hand, true. On the other hand, bollocks.

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Rear windshield mounted Nixie tube scroll

Technically not an “invention involving back windows of cars and LEDs spelling out messages”
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You get the idea. Since most Nixie tubes can only display numbers, they'd be mounted upside down so you could use calculator spelling (e.g., 07734 translates to “hello”, 5318008 translates to… well, you get the idea, again).
ytk, Jun 05 2015

Nixie tube http://en.wikipedia.org/wiki/Nixie_tube
For those who don't know what [ytk] is talking about. [Vernon, Jun 05 2015]

[link]






       Thanks for the explanation, Vernon. But blah on the idea. Not in a good mood, so just blah.
blissmiss, Jun 05 2015
  

       So you'd communicate in leetspeak and volapuk?
normzone, Jun 05 2015
  

       The word "Nixie" is actually an Americanised spelling of "Nixi", the Latin equivalent of "Andrew", after the inventor's son.
MaxwellBuchanan, Jun 05 2015
  

       Who was the inventor? Dr Tube?
Ian Tindale, Jun 05 2015
  

       Or, communicate by finding signage with the words you want, and driving over it such that it becomes entangled in your rear bumper.
sninctown, Jun 05 2015
  
      
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