The second is something I saw posted on uk.transport.london. It's a guess the Tube station competition! It's annoying me at the moment because I can't work out which station it is - I've got it down to which line, and I can name several stations it isn't, but not which one it actually is. Bah.
The third was posted on a private message board that I read. It's about Americans and their attitude to the word "fuck" - more specifically, how news organisations reported on a website with a rude name. I'm very amused.