Body-Part Manipulator

"I wish I had a device that allowed me to change the size of any body part I select with it." As Jon said that, a weird-looking gun appeared on his bed. It had a small view screen on it, displaying two words: LARGER and SMALLER. Jon touched the first word and the two words were replaced by many words: x2, x3, x4, etc. He touched x2 and saw one word appear on the screen: READY. It was flashing. "I guess I just pull the trigger after I point it at a part of someone's body," Jon said. "That seems simple enough," Karyn said. "What are you gonna make bigger?" Jon thought about that, then pointed the device at ...