Marge and Terry are both looking intently at a 4-inch X 4-inch musical symbol, but neither of them is thinking about music. Marge initiates their activity by placing a letter of the alphabet into the upper left quadrant of the symbol. Terry counters by putting a different letter of the alphabet into the lower-right section of the figure. Marge retaliates by inscribing the same letter she used the first time, into the lower-left section of the musical emblem. Terry responds by placing the same letter he just used, into the middle-left area of the image. Marge begins to smile brightly and places the same letter she has been using into the upper-right quadrant of the figure. Terry then grimaces and writes the exact same letter he has been using, placing it in the center of the symbol. Marge then gives a gleeful laugh and puts her same letter into the top-middle of the emblem. She then draws a line and shouts out three words to Terry, which make him feel a bit sad and disappointed. What are the three words Marge shouts at Terry, and exactly what has been going on here?