Star Trek: The Next Generation1987

[in another time distortion, Picard, Riker and Data, inside a turbolift, come face to face with themselves outside the turbolift]

Captain Jean-Luc Picard:
[inside turbolift] It's us before we stepped into the turbolift.

Captain Jean-Luc Picard:
[outside lift] It's happening again.

Lt. Commander Data:
[outside] I feel no disorientation.

Lt. Commander Data:
[inside] Nor do I.

[doors of turbolift are closing, leaving the outside crew alone in the corridor]

Commander William T. Riker:
What was that?

Lt. Commander Data:
I believe what could be termed as the Manheim Effect is becoming more pronounced.

Commander William T. Riker:
This is where we started. If we are us...

Lt. Commander Data:
Oh, we are us, sir. But they are also us. So indeed - we are both us...