If you don't want to know the circumstances surrounding Sunday's entry in this slideshow, then don't read any further...
[spoiler]Sunday's quote:
Ep #308 (1967) - Sam - 'I guess you MUST think there's, uh, some connection. Is that a possibility?'
From "#0307/0308: Robservations 01/09/02: Vicki Puts Her Foot Down"
Sam doesn't believe her, calls her "the master of the evasive answer," and stalks away, leaving Joe to apologize for him.
[/spoiler]
As I've already said, it's really unfortunate that the Robservations doesn't go into this sequence in detail. But here's another chance to remedy that. So, what comes up surrounding the circumstances of Sunday's quote and beyond is that after the commercial break Julia explains that she really should be angry, but she's curious why Sam doesn't believe her. Sam tells her it's because she's been spending her time in one particular area - she goes back and forth between Collinwood and the Old House and after that is when he delivers the quote. And while Julia says anything is possible, she doesn't believe in generalities and she has nothing concrete to tell him. To that Sam says that he expected her to answer with something like that, prompting Joe to call him on his remark. But Sam believes they're all going to end up knowing nothing at all because they're all looking for the same lead. And after Julia questions what that is, Sam says that it's Sarah. But Julia denies looking for her - she asked some pointless questions that only brought meaningless answers because David doesn't know anything. Joe mentions they just found that out and asks Julia if she thinks there's any significance to Sarah, if she's a key piece? And after Julia says she doesn't know and that the problem is to find her, Julia asks why they wanted to see Mr. Collins? And once Joe explains it's to see if he knows anything about Sarah, Julia says she can save them time because she's already spoken to him and he knows nothing. That prompts, "Mr. Collins knows nothing. You know nothing. You know something, doctor - you missed your calling - you should have been a member of the diplomatic corps because you're a master of the evasive answer," from Sam before he stalks off. And as he stalks off, once again Joe calls Sam on his remark, then he apologizes to Julia. She says she understands and reassures Joe she's doing all she can. Joe is sure she is, and after saying good-bye, leaves. And that's when things conclude with Julia's real meaning about how she's really doing all she can (as illustrated in Reply #669).
And this is the third quote not only from this ep but from this sequence. The first (Julia - 'These pieces MUST be collected in any way possible, however unorthodox it might seem') was back on May 14th. And the second (Sam - 'You MUST know something-- you MUST have some lead') was back on February 24th.