Y'havin' a laugh?

Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=26&t=83130
can someone explian this one to me, thanks a lot:
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(check the callsign of the answering aircraft)
CZQM: "Nova 895 contact Moncton on 127.12"
ARN871: "Over to 127.12, for Nova 871. We'll talk to you later."
CZQM: "Maybe sooner than you think."
(a few seconds pass...)
ARN871: "Uh, Moncton, they didn't want to talk to us on 127.12..."
CZQM: "See what I mean?"
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Lost student pilot: "Unknown airport with Cessna 150 circling overhead, identify yourself."