How much do you know about the most celebrated personal stereo of all time, one that is today turning the big Three Oh? A lot? OK, hell, let’s see what you got: 1. In the Walkman’s first 10 years, how many different designs did Sony release? A) 25 B) 70 C) 130 D) 170 2. What was the full …

To commemorate the Sony Walkman ’s 30th birthday, here are the trippy ads Sony used to promote it in the ’80s. Noble monkeys, off-key kids and sweet-toothed senseis—where’s that f’d up sense of humor now, Sony? Back in 1983, Sony declared the WM-10 Super Walkman the “world’s smallest cassette player…