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If you look through a digital camera at a remote control's output end you can see the infrared LED of the remote as a purpley whitish color?
The digital camera CCD picks up nonvisible spectra of light and shows them visibly on the LCD screen.
It's a neat trick and a good way to help diagnose a nonfunctional remote.
if you look at a computer screen and do a fart noise with your tongue, the screen wobbles but only you can see it
Something I have noticed is if i cough while I am looking a led or a screen, it jiggles really fast. I am not sure if it is because my eyes giggle, or if I am seeing a space-time distortion with the light frequencies. I have noticed other light distortions as well like if I hold my finger to a light far away, the light bends around my finger tip. There are many tricks you can manipulate with light rays.
If regular cameras are built to take in infrared light then why doesn't it pick up the infrared radiation humans emit?