If you don't want to know the circumstances surrounding Monday's entry in this slideshow, then don't read any further...
[spoiler]Monday's quote:
Ep #195 (1967) - Liz - 'Oh, I know what you MUST have heard. You heard Vicki.'
From "#0194/0195: Robservations 10/05/01: Enter Jason McG"
No, says Carolyn, your door has a very specific creak, as do several of the floorboards in the hallway.You must have heard Vicki, says Liz, she came to check on me a few times last night--didn't you, Vicki? Yes, I did, Vicki agrees after a moment.
[/spoiler]
Rather than reference the quote directly, the Robservations combines the two parts of the quote into one - though at least it does use the word "MUST". Though the one place where the Robservations excerpt indicates a use of "MUST" but the show doesn't use it there is after Carolyn protests that what she believed happened didn't seem like a dream and Liz actually says, "Well, it was because I didn't get out of my bed."