My date comes back from the bathroom, and as she's about to sit down, looks startled and stands back up. She excuses herself for being at the wrong table.
I tell her she's actually at the right table and that her confusion is the result of my unique ability. I tell her what that ability is, without providing details.
She hesitates a moment, and I suspect she is about to bolt. Then she slowly returns to her seat and says, "Okay, I'm listening."
Dating is so much more interesting when you can switch genders at will.