I’ll start off with one, Being upset about a breakup that happened hundreds of years ago.
Edit 1:
- Heath death of the universe, Death of the sun, etc, does not count. I feel like focusing on this is an overused point.
Edit 2:
- Loneliness does not count. I feel like we all know immortality means you’ll miss people and lose them.
Actually it was a two-parter, S09E5&6 (of the reboot), called The Girl Who Died and The Woman Who Lived.
Here’s a clip of the relevant bit!