"Because... Because I'm angry! You and Maud get to go off and leave the farm and have fun lives, but I have to stay at the farm, and slave away, and basically have all my decisions in my life made for me! Nopony asked me if I wanted to inherit the farm! And nopony bothered to find out how I feel about having my life planned out for me! I'm angry, and Marble was the easiest target for me to take my frustrations out on, because I couldn't do anything to the two ponies making me so angry."