"You think it would be funny to hold me down and see my tail turn back into legs?" she says angrily.
"How did you know?"
"We mermaids are telepathic."
"Oh..."
"Lets see how you like being held down and transformed!"
The next thing you know your legs feel weak. Your pants rip apart as your legs pull together and form a silver tail much like that of the mermaid in your lap.
"Why did you have to go and do that?"
"Be thankful I turned you into a merman and not a mermaid!"
You realize your situation: you're a merman sitting in a changing room with a mermaid in your lap. "How has this helped the situation?"