(Sandra’s going to hypnotize David right in front of his friend and make him their laughably submissive slave for a little while, to Jen’s amazement and amused glee)

David works at Sandra’s cafe. Sandra (she's in her late forties) has been hypnotizing David, always making him completely forget that it happened. David doesn’t even know he’s ever been hypnotized at all.

One summer day, the cafe was almost empty when one of David’s best friends, Jen, popped in to say hello to him at work and get a cold drink. 
“You two know each other?" she smiles. “I’m Sandra.”