I thought for sure that we had discussed this here, but I'll be darned if I can find it. I did find a couple of interesting ref.'s, though:
Interestingly, the Swedish word to describe corny, provincial or even farcical comedy -- principally on the stage -- is 'buskis'. This must derive from buskin -- if so, an example of a word taking an opposite meaning through misunderstanding.
http://wordsmith.org/board/showthreaded.pl?Cat=&Board=weeklythemes&Number=57979

and

Vaude slang referred to unsophisticated comedy as being "stuck in the corn," soon shortened to "corny."
http://wordsmith.org/board/showthreaded.pl?Cat=&Board=miscellany&Number=83457

P.S.--Welcome aBoard, websafe! Glad to have you.