Overheard in IFR Magazine's "On the Air"

While cruising through New York's class B airspace on a busy Friday evening I heard this:

Cherokee:
"New York departure control, Cherokee One Two Three Four Five off Teterboro: 1,000' climbing to 3,000'."

New York Departure:
"Cherokee One Two Three Four Five, why are you squawking 3012?"

[pause]

Cherokee:
"Umm. I don't know, sir."

New York Departure:
"Cherokee Three Four Five, 3012 is the altimeter setting; you're supposed to be squawking 4020."

Cherokee:
"Roger, New York. Squawking 4020."

Lin Weeks
via e-mail