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 #660 (1969) - Julia - 'Barnabas, if you should disappear, someone MUST know about it.'
From "Robservations 9/24/02 - #660-661 - A Trip Back to the Past"
We see Barnabas' portrait in the foyer, and he's looking at it with a resigned expression. Julia comes down to report she thinks Maggie is relieved the trip is off. Barnabas makes it clear he's leaving, realizing she isn't sympathetic to all of this, he says would be better for her to stay out of it--I'm going to ask Stokes to help me back to the past as he did Peter Bradford. Julia wants to go along; if he disappears, someone must know about it. He agrees to this practical suggestion and tells her to hurry. Vicki has so little time, he frets; if I'm right, she might hang tonight.
[/spoiler]
The Robservations references the quote well, though not perfectly...
And Barnabas actually says that "Vicki will hang tonight," with certainty. There's no "might" about it.