I really appreciated the sense of humor in this kata! It made it a lot of fun. But it would probably be a good idea to rename the #each test, because

#each:
should execute the block for each item in the bag. why are you messing with this method? work on #every? instead.

is very confusing, and seems to imply that we cannot use the #each method in the kata. So this kata could use some revision for clarity. Other than that I liked it though.