You: "Wow, really? That's awesome!"
Me: "Yeah, that's a trade last, so now you have to tell me next time someone says something good about me."
You: You got it!
(six months later)
You: "Hey! I heard Peggy thought your butt looked great in those jeans."
Me: "Wow, really?"
You: "Yeah! That Peggy sure is obsessed with butts."
Me: "She's not very discerning, either."