Plasma, CRT screens ...and most inexpensive LED string lights (Xmas, party lights, etc). They all make me slightly nauseous or dizzy somehow. It's similar to the sensation I get when too many people are talking (I have an auditory processing delay/disorder that is very similar to dyslexia for spoken words).
*I so missed green screens until LCDs replaced CRTs. I recently booted one up that had been in storage and even compared to nice modern LCDs (which still have the LED flicker in the backlight), that soft, slow green glow was so....soothing.
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“For small creatures such as we the vastness is bearable only through love.”
―Carl Sagan