The Humans Are Dead
I shouldn't think the Robots song from Flight of the Conchords is so funny, considering it's coming true now.
So it goes. It was nice knowing you, fellow humans.
PS - There's no video here, just the song. You can find a bunch of live performances on YT, including a great recent one, but honestly you can't appreciate them unless you already know the song, and the original studio version here is the purest.