Steins;Gate2011

Kurisu Makise:
[after they kiss] There was a scientific rationale for that! Because... important memories including, but not limited to, one's first kiss, are stored in the hippocampus, which makes them harder to forget. So I figured...

Rintarou Okabe:
There's just one problem. You're assuming that was my first kiss.

Kurisu Makise:
Kissing your pillow doesn't count you virgin!

Rintarou Okabe:
You would know wouldn't you?... Nevertheless, my first kiss lacked that romantic je ne sais qoui. Either way, my hippocampus didn't get that one. Let's try it again. [Holds her face] I can't risk forgetting this, not for anything.

Kurisu Makise:
I mean I guess that's logical. And it's just a kiss. [In her head] It feels like time is passing so quickly. Damn you, Einstein! Your science is crowding in on our kiss! He was right Okabe. The passage of time depends entirely on where you're standing. Relativity Theory... it's so romantic. But it's just so tragic too.