Long time since I watched Angel (overdue!) but the one I remember liking most was Angel and Spike arguing debating Astronaut v Caveman fight results.

On Buffy, I think it was after Buffy’s resurrection, when he he told her how he didn’t save her when it mattered but how he has saved her every day since.

Or maybe when Cecily rejects him. Watching him, I was moved. I know people say that all the time, but I really was. And it was a bunch of emotions. At the time, I watching him and lost in the story and I really wasn’t thinking about the acting at all. But later, I knew the guy was a great actor and didn’t just happen into a role that was a great fit.