G.R.O.S.S.= Fight Club?

I got here because I went there because Ben said I should.

And clubs like this, of course, have their beginnings in backyards,
tree houses, and garages all over America. Not surprisingly, Calvin started such
a club when he was six years old. Little did anyone realize that he would
construct another one much later in his life, again with the aid of an imaginary
friend. For just as Calvin, Hobbes, and Susie have dark future versions in Jack,
Tyler, and Marla respectively, G.R.O.S.S. (Get Rid Of Slimy girlS) has the same
in Fight Club.

G.R.O.S.S. shares the following characteristics with Fight Club:

Both have catchy names (although the "slimy" part of G.R.O.S.S. is
redundant, otherwise it doesn’t spell anything).

Both are co-run by a friendless male and his imaginary companion (Calvin
is Tyrant and Dictator-for-Life; Hobbes is President and First Tiger).

Both are exclusively male organizations, although Fight Club’s membership
is considerably larger.

Along with that, all members of both organizations are very loyal.

The leaders of both organizations constantly engage in fisticuffs (but
only in G.R.O.S.S. does a member receive a demerit for biting).

And in said fights, in both organizations, there is only one fight at a
time!

Both are supposedly very secretive (though Jack never tells his mother
about Fight Club).

At least one leader of both organizations is fond of giving speeches
(though Calvin never uses the term "space monkey").