So, I go into a local coffee shop to cop a little wifi, and order a cup of "unleaded"...
Whereupon the kid behind the counter gets this deer-in-the-headlights look on his face. I then have to re-specify that I want decaf.
When I get it, he asks me "What's the deal with 'unleaded'? I heard about it in a science class, but I never really understood it."
After I explain to him about gas stations and Regular versus Unleaded, he understands the reference - and I realise that he never knew about gas stations offering anything but unleaded gasoline.
On the heels of that I realized just how OLD I am.