In episode 22, the whole scene where Okabe declares his love for Kurisu.
When Okabe sees the D-mail from his future self. Hearing that all the heartache and sacrifice that time travel put them all through is what opened the path to the Stein's Gate timeline. "It all meant something," indeed.
In episode 23, when Okabe meets Kurisu again after thinking he had lost her forever. Doubles as Tear Jerker.
Suzuha's ending, where she wants Okabe to accompany her to 1975 so she doesn't fail in her mission and hang herself, even though they may both lose their memories once they get there and they cannot return to 2010. He does.