Keeping hydrated??
Here’s a LOL/semi-CIDU courtesy of Dale Eltoft – and thanks for the intro to Ryan Mason / At Random Comics.
I had trouble with the premises of the original Topper TV series because I didn’t understand the distinction between when the ghosts would “dematerialize” and when they were simply invisible.
Comics I Don't Understand 
Swapping bodily fluids? Or accelerated osmosis?
The unicorn ought to accept that the scenery is more beautiful!
With all due respect to Topper, ghosts are not material and therefore cannot “dematerialize.”
Why is that a semi-CIDU? Is there some confusion about exactly who she “took care of”?
Is there some sort of joke associated with the Roz Chast piece?
Ed, there is a real thing of “quiet car” designation on some commuter train lines. So Roz Chast is picturing a step up from that.
In retrospect, no. But when you approach it contextless, on first take there certainly could be some uncertainty.
I think the couple kissing on the bench might be a reference to the scientific phenomenon of siphons.
Re: “ghosts” –This showed up in Rubes last month:
NO drinks after dinner – a torture I remember well!