15 February 1979
Huh. Has the piano ever made another appearance? Jon doesn't seem the type to own one
The only other strip I could find featuring a piano is from May 20th, 1980.
EDIT: Further research has uncovered this one from December 1979 as well as this one from October 1985.
That was quick, thanks! Clearly, Jon realized he'd never play the piano and stored it away in the attic, where it dropped through the ceiling in the 1985 strip.
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It's ok here