Can't eat just one...
Once I get started watching those little National Geographic shorts, my next hour is wrecked.
For example, just TRY not to watch this video of an Andean species of bird that vibrates its feathers at 1500 hertz, playing a note like a violin.
Or this, the barrel eye fish, which has a see-through head, like a cockpit canopy.
Or this jaguar catching a young crocodile.
I could watch this stuff all night. . . .