http://whatculture.com/tv/doctor-who-top-7-heartbreaking-moments.php

They will break both of your Whovian hearts.

7. The Regenerations - I don't see what the big deal is about the regeneration, I mean you KNOW the Doctor will be back, it is the actor that gets the heave-ho.

6. Amy Pond - sorry this is my #1

5. Doomsday - the loss of Rose (she has come back a few times now though, whereas Amy CAN'T come back)

4. Rose in the Barn - see - she came back for the 50th anniversary, that wasn't sad at all.

3. Just This Once, Everybody Lives - don't think I have seen that one.

2. Senior Doctor - I was very sad to see Matt Smith go

1. Clara’s Last Hug - I am still confused by this; could Clara come back, or not?