Well, he thought. I tried one extreme. Might as well see what it is like at the other. Let's see how it feels to be really tall.
Zach, now Zoey, fiddled with the settings on the smartphone application. He thought he had entered 6'4", but instead accidentally entered 4'4". He closed his eyes, reveling in the feelings of his change. He had expected to feel his clothes getting tighter. But strangely, his clothes felt loose and it felt like he was dropping in an elevator. He opened his eyes and stared up in shock at his equally surprised younger sister, Sydney. He quickly realized that he was looking up at her - his 5 foot tall sister! Something had gone wrong. He shrank, instead of grew.
"Who the hell are you, and how in the hell did you do that? " said Sydney angrily.
Zach made a dash for his phone, but Sydney reached it before he could.
"What's this? Did you use this to shrink like that?" asked Sydney.