Or possibly Journey's End in having to work out what the fuck to call a second version of a character who is already primarily identified by a number Or even Journey's End in realising you can now have three way ship wars within your one OTP
Celebrating both Ten and Cloen, so everyone gets some love. Temporarily in Ten's case, but I'm sure he got over it eventually.
So then... end of a season, end of an era, a new ending for Rose Tyler (and arguably the happiest possible one for her and the Doctor). What did y'all think the first time? Were you pleased or freaking the fuck out?