Picard: It's us, before we stepped into the turbolift. Picard: It's happening again.
Data: I feel no disorientation.
Data: Nor do I.
Riker: What was that?
Data: I believe what could be termed as the Manheim effect is becoming more pronounced.
Riker: This is where we started. If we are us.
Data: Oh, we are us, sir but they are also us so, indeed, we are both us...
The Enterprise has been investigating a time distortion phenomena caused by some scientists who were messing around with time. Riker, Data and Picard all get on the turbolift when the doors open and they are faced with Riker, Data and Picard....yes....you read that right....and no, I didn't make a mistake with how I typed out the dialogue. There are two of each of them and they are talking to each other and themselves and their other selves.....or something like that.