You laugh because you know it's true. We've all been there...
In high school, we had a blonde cougar teacher who the basketball coach just loved to flirt with. He'd bring her stuff, hold the door open.
Well, one day he brought her a pastry of some sort. She was "thank you!!!...Blah blah blah" She closed the door to our class and said "what a sucker!" We all thought her to be a dumb floosy but she knew what the hell she was doing!