She takes her shirt off

"Now, let's start things off with a simple example of what hypnotism can do!" Harry said. He lulled the six remaining students back into a deep trance before giving them a few instructions. "When I say 'cold' you will feel like you're freezing. Picture being at the north pole in the middle of winter. And when say 'hot' you will like you're roasting. Imagine being stuck in the desert at high noon. Once I say 'normal' you'll feel the temperature return to its regular level. Now, wake up!"

Mackenzie and the rest of the students snapped out of their trances, unsure what had just happened.

"Now stand up, if you please." The volunteers did so, feeling completely normal despite the embedded commands in their minds. "Say, is it cold in here?"

The effect was immediate. Mackenzie suddenly felt absolutely freezing! She hunched over slightly, crossing her arms over her torso. Her teeth began chattering as she rubbed her hands furiously along her arms, desperately trying to warm herself. Beside her, the other five students were doing similar things, all seeming like they'd been trapped outside in the ice and snow. The audience began applauding at the hypnotist's skill.

"Or perhaps it's actually hot in here." Harry said.

The freezing sensation suddenly disappeared, and Mackenzie found herself feeling comfortable for a second. But just a second later she began to feel a wave of heat washing over her, and it quickly got hot to the point of discomfort. All around her, the other students were fanning themselves with their hands, or flapping their shirts in an effort to cool themselves down. As the audience clapped again, Harry looked pleased at the display he had elicited from his subjects. But what Harry couldn't have known was what was about to happen next.

It had been a particularly hot summer the past few months, and it had taken its toll on Mackenzie. Often, she had trouble staying cool enough at night thanks to her bedroom fan breaking. So, to compensate, Mackenzie had developed a bit of a habit on the super hot evenings. Since she was in the privacy of her own room, Mackenzie would simply take off her shirt and shorts, spending the rest of the warm night in just her underwear. Mackenzie did it often enough that sometimes she'd wake up in the middle of the night and take her clothes off without even fully waking up!

Now, her half-asleep mind fell back on its ingrained habit. Rather than fanning herself, Mackenzie began pulling her shirt off her body. She took it off, revealing the plain white bra supporting her lovely breasts, and let the top drop to the floor. Lukewarm applause suddenly turned to enthusiastic cheering, much to Harry's delight. That was, until he glanced over and saw why the crowd was so loud. Mackenzie stood there without a shirt, already beginning to unbutton her pants.

"Whoa, stop!" he shouted, running over to Mackenzie. "Normal! Stop!" Harry wasn't looking to get in trouble with the college for accidentally stripping one of their students onstage.

Mackenzie snapped fully back to her senses, and it only took a moment for her to realize she was in front of a large crowd without a shirt on. She gasped and crossed her arms over her chest, blushing wildly. Mackenzie looked for her shirt on the stage but it seemed in all the commotion someone in the audience had reached up and taken it.

Harry stood in front Mackenzie, shielding her from view. "Sorry about that folks! Things got a little out of hand there. Did anyone happen to see where this young lady's shirt wound up?"

A round of laughter echoed from the audience, who clearly thought this was part of the act. But no one in the front rows volunteered the shirt, so Mackenzie was stuck with just her bra. The redhead desperately wanted to get off stage and out of sight. This was already bringing up too many embarrassing memories for Mackenzie.

"Heh, well..." Harry said meekly. "Sorry about that. But let's, uh, continue the show, shall we?"