Thunderstorm-warning plaque on Half Dome
Plaque on top of Half Dome
This plaque sits atop Half Dome, offering last-resort advice to anyone unfortunate enough to get caught in a lightning storm there. Here's a transcription of the English portion - please make sure you'll never need to know it:
If a thunderstorm occurs while you are here, these are the safest things to do.

1. Stay away from the cables.
2. Get rid of any metallic objects.
3. Stay away from caves, overhangs, and large cracks in the rock.
4. Go to the lowest place on top and sit on any non-metallic objects you have to insulate you from the rock. WAIT! Stay there until the storm has passed.