Rollerskates 旱冰鞋 (hàn bīng xié)

Card description:
In the era where ABBA dominated the radio and John Travolta was actually desirable, rollerskates were the bomb. Credits to whoever invented rollerskates, as it really did give millions around the world a fantastic new form of entertainment.

In fact, it's probably not an exaggeration to say that a whole generation of children were born because their parents met each other having fun on skates.