Morton Koopa Day is the day Morton Koopa Sr sacrificed himself for Bowser. Bowser Jr's parents want to be left alone on this day. Trivia As shown on the Koopapedia article, it is shown that Morton Koopa Sr might have died in a battle with Mario. As seen in Two Koopas for a Throne, it is shown that Morton Koopa Sr died in a battle with Mario. Retrieved from "https://adaywithbowserjr.fandom.com/wiki/Morton_Koopa_Day?oldid=4949"