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 #271 (1949) - Liz - 'MUST I?'
From "#0271/0272: Robservations 12/05/01: Digging Up Paul"
He assured her that, for Carolyn's sake (the bastard), he would bury the body in a trunk in the basement, and she would have to stand guard from then on to make sure no one found out (explaining her 18 year self-imprisonment; as the keeper of the key to the crime, she had to stick around and protect it).
[/spoiler]
Well, the streak comes to an end. But I suppose that's what happens after you say you're getting spoiled. Plus this is one of the Robservations where there is little detail.
So, as for what actually happens in the scene, after Jason comes up from the basement, he finds Liz still pretty much out of it as she leans against the wall near the entrance to the foyer. Thunder echoes around her. He informs her that he did what they planned and now no one will ever know. Liz echoes, "No one?" "No, no," he assures her. Then after taking her arm he instructs, "Come with me." "Where?" Liz asks as she resists. Jason says he has to show her where it is. "No," she protests. But Jason explains that she has to close up the room and lock it and not let anyone in there because otherwise they'll find out. Liz still protests, "No. You lock it. You do it. And then give me the key." Then it's Jason's turn to protest, "No, no, no, I have to show you where it is so that you'll know. You'll know I did my work. Now come on." And it's at that moment that Liz asks the quote. A loud clasp of thunder rumbles as Jason replies, "Yes, ma'am, ya must." Liz sighs like going down the basement is the absolute last thing she wants to do but she then begins to move off followed by Jason.
This is actually the second quote from the ep. The first (Jason - 'You MUST all try to be very calm.') was back on April 24th.