When Flynn explains to Tron and Yori that Users are just as fallible as Programs. While disbelieving at first, Tron seems to take the revelation in stride. Perhaps because he now knows both group have something in common.
Tron: If you are a User, then everything you've done has been according to a plan.
Flynn: You wish. You guys know what it's like... you just keep doin' what it looks like you're supposed to be doin', no matter how crazy it seems.
Tron: That's the way it is for programs, yes.
Flynn: I hate to disappoint ya, pal, but most of the time, that's the way it is for Users, too.
Tron: (more amazed than disappointed) Stranger and stranger.