One year
Soviet plane-spotting head-gear: Drakegoodman scanned this 1917-ish photo of Soviet planespotters in exotic headgear; according to a commenter, the binox are focused at infinity "so that when you found the source of the sound by turning your head, you could see the aircraft creating that sound."
Five years
Ralph Lauren opens new outlet store in the Uncanny Valley: Dude, her head's bigger than her pelvis. From Photoshop Disasters (thanks, Antinous!)
Ten years
Internet bubble's blessings: The aspect of the Internet Bubble that the press seemed most taken with was the youth of some of the startup founders. This too is a trend that will last. There is a huge standard deviation among 26 year olds. Some are fit only for entry level jobs, but others are ready to rule the world if they can find someone to handle the paperwork for them.