I worked at NASA GSFC for a summer. I was wandering around the hallways one day, and came across an article from an ophthalmology magazine that had been taped to a door. It told the story of a guy who caught a reflected laser beam in the eye - he heard a “pop,” and lost vision in a portion of his visual field. They had photos of the damage to the eye, and a description of his prognosis (vision gone in that area forever).
At the bottom of the article, someone had written:
“The laser in this room 10,000 times more powerful than the one in the article - wear your safety goggles!"