Carol Burnett -- Sued FROM THE GRAVE Over Home Video Deal

For once, someone's NOT laughing at "The Carol Burnett Show" -- namely the guy who helped create the TV classic, and is now suing over a home video deal, but the catch is ... HE'S DEAD.

The lawsuit was filed Wednesday in LA County Superior Court by Bob Banner's production company ... and according to the docs Bob had a partnership to co-produce the show with Carol from 1967 to 1972.

Bob died in 2011 from Parkinson's disease ... but according to the lawsuit Burnett and Time Life struck a home video distribution deal in the summer of 2012. The suit alleges Bob -- or rather, his company -- was cut out of the profits from that deal.

Banner's company is demanding a full accounting of all profits earned from the 'Carol Burnett Show' -- including the home video deal ... and, of course, wants its cut.