You're currently having Math lessons at your class right now.

Discussing, and making them lecture it.

After explaining a math equation, Adam, your student raises his hand.

"Yes you?" You pointed up to him.

"What if I can prove you wrong professor?" He said.

You walks up to him, "then explain it to me later, come to my office."

He nodded, and smirk.

He did that on purpose just to get extra private lessons with you.