Fantasy Balloon Gum (妄想フーセンガム, Mōsō Fūsen-gamu?) is the 275th chapter of the Urusei Yatsura manga. Ataru steals a magical bubble gum from Ten and Kotatsu-neko hoping to fulfill his lecherousness by creating seductive versions of his favorite girls. However, Lum interferes and decides to teach him a lesson and in the end, Ataru gets stuck on the school rooftop, by the gum.