"Since we're all guilty of redoing the same activities that relate to our main interests.. then I declare tomorrow, for the entire day, we behave in the OPPOSITE way then we normally do!"

Opposite Day is the sixth and penultimate comic in Season 8 of Sibling Rivalries, and the 66th comic total.


While at the siblings' "monthly meeting" to announce what fun activity they should all do to begin the month, after fighting between the siblings about always choosing the same activities every month, Gerry announces that the siblings have an opposite way and behave parallel to how they normally do. This proves to be a fun idea until they are caught off-guard by Joel, yet they must not break character to stop him.

Character Appearances

♥ = character's debut
♠ = character does not speak throughout comic (does not apply to Claude)
♣ = character is mentioned only
♦ = character appear in a speaking/non-speaking cameo only

McReary-Wilson Family

McReary Siblings' Friends

Anthony DeoBer's Family




  • This comic was released on the seventh anniversary of the series! July 8 is also the release date of first comic "Hello, Wisconsin!" from 2013.
  • The title is shared with a SpongeBob SquarePants episode, being the second time a SR title is named after that from SB after "Best Frenemies" in Season 5.
  • It is revealed that for every month, the siblings have had monthly meetings where a sibling chooses an activity to start the month. This marks the first appearance of the meetings.
  • These are the "opposite" behaviors which each sibling has:
    • Packie and Francis are both very grumpy and pretend to hate each other, yet they listen to music together. They pretend to dislike Eminem and only listen to Beethoven, and they refuse to play any video games
      • This also reveals that Beethoven is the brothers' least favorite music artist. While behaving in the "opposite" way, they in fact listen to Fur Elise after getting mad at an Eminem song. This is the first time classical music is featured in the series, although it can only be referred to by name and drawn with music notes since comics cannot have audio
    • Gerry is not athletic at all and only sits around lazily without getting any exersise, while eating bad foods. He openly mocks football as well, or any sport for that matter while in character
    • Derrick portrays himself as dumb and pretends to not understand a simple thing that is spoken to him
    • Kate pretends to hate Mark and does not believe in love at all. While she is normally very bratty and sassy, here she pretends to be the nicest girl ever and it can even get on one's nerves just how nice she is
  • The villains hypnotize the McRearys' friends and turn them against the siblings, being the second time after "Get Rec'd!" where hypnotism was employed.


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