@KaraLG84 Ahhh yes, a popular variant of the Joo Janta 200s!

(Confession: I had to look up the quote to remember the brand)

“Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses have been specially designed to help people develop a relaxed attitude to danger. At the first hint of trouble, they turn totally black and thus prevent you from seeing anything that might alarm you.”