Sneeze
The most closest thing to an orgasm. The feeling, the built-up, the release...Similar. Except, the sneeze is only in your nose. Hence why, they call it a nasal orgasm.
Oh wait...I...I...I'm about to....sneeze....Oh, oh, ah, ah, ugh, ugh, ugh, God.....AaaAaAaahhhhhchooooooo! Whew! That felt good. Excellent release.