Only one

Chuck thought about it. If he blasted all three women, someone might see him and question what he was doing. So he decided to start small.

One of the women, the brunette, got up, probably to use the bathroom. Chuck followed her and once she was a pretty decent distance from her friends, he zapped her with the dial on one.

"What's your name?" he asked her.

"Monica," she said. "What was that?"

"Nothing. Listen, Monica, you trust me completely and know I would never steer you wrong."

"Of course."

"When you go back to your friends, I want you to insist they call you Tits McCumbreath. It's French for 'refined and dignified', and if they tell you otherwise, they are wrong and think themselves more sexy than you."

Monica nodded.