From "The Top Comes Off," by Erle Stanley Gardner:

[This is one of those proto-Mason stories about lawyer Ken Corning and his assistant, Helen Vail.]

***

"What name are you registered under?"

"Bess and Edna Seaton," she said. "The room's five-thirty-six."

"Which is Bess and which Edna?" asked Corning.

"Be your age!" she said, and hung up.

[A little later.]

Helen Vail grinned at him. "I came to tell you," she said, "that I'm going to be Bess. We tossed up for it."

[And is it just me, or does the "Be your age!" reaction raise more questions than it answers? (It certainly doesn't answer "Which is Bess and which Edna?"--which I guess, prior to the coin toss, is an unanswerable Schrodingerian question.) Now, to me, "Which is Bess and which Edna?" seems not only like a reasonable question but one to which the answer might be important for Corning to know. However, we're told that Corning grins after Helen hangs up on him, so I feel there's a joke I'm not in on. Tangentially, I'd like to note that Edna is a funny name; as supporting evidence I offer Woody Allen's "The Cartesian dictum might better be expressed, 'Hey, there goes Edna with a saxophone!'"]