FUNNIEST. JOKE. EVER.

So I found £10 on the ground during my lunch break today and decided to go to Subway. I've never ordered anything from there before but feeling I could splurge a little I asked "What's the most expensive sub you have?" they told me "Fernando Torres" KEKEKEKEKEKEKEKEKEKEKEKEKEKEKEKEKE（⌒▽⌒）

I don't get it.

I never understood the name. What does public subterrean transit have to do with sandwiches?