The Chosen Ones

Which of these is the saddest?

Someone who doesn't know who lives at 1600 Pennsylvania Avenue but does a pinaple under the sea.

Someone who thinks 1 + 1 = window

Someone who asks you what's the most stupid question anyone asked you? (that question of course)

When someone asks for the time, even though they are waring a 5 watches, have a not-in-use cell phone, and are next to Big Ben or some other large clock

Other (please post it in a comment)