Prove it
"You've got to be shitting me right now. Do you honestly expect me to believe you? You're bluffing Len."
"Sara I lie about almost everything- except this. I would never lie to you about this."
"Fine. Then prove it."
"Really? Are you doubting me?"
"Well Leonard, when you make the bold claim that you can unhook my bra without using your hands, I tend to be a little skeptical. So yes, I want you to prove it."
"Fine, as you wish."
*snap*
"Do you believe me now?"
"Yes. And since you already have my bra off, I expect you to finish the job." She said, giving him the sexy smirk that she knew he couldn't resist.
A little later, as he was kissing her neck, she whispered to him. "I know it was a magnet."
While she said this though, his thoughts went back to all the other girls he used that trick on. None of them had ever figured it out. He knew Sara was smart but it was times like these that made him stand in awe of her. She truly was the best he'd ever had, and he hoped the best he would ever have.