The last scene of Criminal Minds, S3E2

Waitress:"You got enough to eat, honey?"

Gideon:"Oh ya."

Waitress:"Travelling?"

Gideon:"Ya."

Waitress:"Where you headed?"

Gideon:"No where particular."

Waitress:"How will you know when you get there?"

Gideon:"[Smiling and thinking]That's a good question.  [Glances at Waitress's name tag]Rose, that's a good question. Have a great day."

Waitress:"You too."

Gideon's OS: "I guess i'm just looking for it again. For the belief i had back in college. The belief i had when i first seen Sarah, and it all seems so right."

Reid's voice of reading G's letter:" The belief of happy endings."