Imagine...

Skip intro
(click if you don't have Javascript)

...You land at Heathrow airport in London and British customs confiscate your eyeglasses. "You can have them back in six months," say the officials.

...A Welsh friend of yours, who is deaf, has to leave her hearing aid at home whenever she leaves the country.

...On a tour of Europe, you go skiing in Italy and break your leg. You want to continue to your next destination, Scotland, but you have to change your ticket to fly through London because Edinburgh does not have a "Crutches Reception Centre".