Polaroid Swinger (1965)

In the mid-1960s, no gift for teens and preteens was cooler than the $20 Polaroid Swinger instant camera. (Okay, it actually cost "nineteen dollars and ninety-five," as immortalized in one of the catchiest ad jingles of the decade.) The Swinger's big innovation was its pinchable photometer button: When the shot's light was just right, the word "YES" lit up in the viewfinder. Of course, the newbie photographers for whom the camera was intended were likely to focus more on the "YES" than on the actual composition of the shot. Photo courtesy of Polaroid.