Jon stepped out of his room and nearly ran into his little Goth sister, Zoe. She gave him a sneer as she pushed past, and Jon decided that this was a good opportunity to test his new power.
"Zoe, I curse you to have a chubby body for the next ten seconds."
He smiled when Zoe's black t-shirt and ripped jeans tightened and began to strain at the seams. She was normally a skinny girl, and she suddenly looked as if she had gained 40 or 50 pounds. She looked down at herself, and said "Oh my god!" before running into her room and slamming the door. Jon counted to ten in his head, and knocked on Zoe's door.
"What's the matter, sis?" he asked.
"Um... nothing, I guess." Zoe opened her door and looked at him. Her body was back to normal. Her shirt looked a little stretched out, but nothing extraordinary. She didn't seem to associate her change with him at all.
Jon said "Ok, just wondered why you were acting weird, Zoe," and headed out the front door.