If you show a picture of these to anyone over the age of 30, there's a good chance they can tell you what they are. Anyone under the age of 30? Well, let's just say they'll have some spirited guesses but nothing accurate. If you don't know...they're roller skates from the 1970s! Roller skating, roller derbies, and roller rinks were maybe THE hottest trend in the 70s. As kids, you had the clunky metal strap-on roller skates that attached right to your shoes! Hopefully you didn't lose your key, otherwise there's no way those puppies were fitting properly!Ahhh,