On the lighter side... enjoy this flash from the past!
"The Polaroid Model 20 'Swinger' was a popular Land Camera produced by the Polaroid Corporation between 1965 and 1970. At $19.95 USD it was the first truly inexpensive instant camera, a fact that helped fuel its enormous popularity and made it one of the top-selling cameras of all time. The Swinger was especially successful in the youth market due to its low price, stylish appearance, and catchy 'Meet the Swinger' jingle in a television advertisement featuring a young Ali MacGraw. The Swinger featured an extinction exposure meter tied to the aperture which displayed the word 'YES' in a window below the viewfinder when the exposure was set correctly. Earlier models also displayed the word 'NO' when not properly adjusted, while later units used only the YES indicator. The Swinger also included a built-in flashgun for AG-1 flashbulbs." - Wikipedia