Syrio Forel was the first sword of Braavos.

Butcher_Of_Hope made a few more high quality Syrio Forel gifs.

In that scene the full quote is:

In season 1 episode 8 we get this one:

Is Syrio Forel still alive?

http://pandawhale.com/post/16944/is-syrio-forel-alive-and-other-game-of-thrones-theories

Imgur comments: http://imgur.com/gallery/EP1ce

Reddit comments:

http://reddit.com/r/gameofthrones/comments/25dfay/s4e6_anyone_else_notice_this/

Syrio Forel makes his first appearance in the final scene of Game of Thrones S1E3.

And his final appearance in the first scene of Game of Thrones S1E8.

Not today.

http://pandawhale.com/post/10661/what-do-we-say-to-the-god-of-death-not-today-syrio-forel-and-arya-stark