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 #481 (1968) - Cassandra - 'You will do anything I ask. Anything. But you will not remember what I have told you or what you MUST do.'
From "#0481/0482: Robservations 05/14/02: Cassandra Thwarts the Good Guys"
"You're angry," she says, and he says, "You--you made me come here." He doesn't understand her power, but she says there's no need for him to. It's wrong meeting her, she's married to Roger, but she says they aren't doing anything wrong. She demands he look at her, and reluctantly, he finally does. "You will do anything I ask," she demands, "anything, but you will not remember what I have told you or what you must do."He agrees.
[/spoiler]
The Robservations references the quote perfectly...
And this is the second quote from this ep. The first (Julia - 'Another reason you MUST NOT do it') was back on September 5th.