“The one about inspiring a fanfic was real wasn’t it?” Actually, no, there aren’t any books that got me to actually commit to writing fanfic so that’s technically speaking a pure joke.
“You made up the one about the Family Ties book though?” Well, no, that’s real and true: I have a book that’s an original adventure based on the beloved-yet-not-actually-watched-anymore series Family Ties.
“Why do you have a book based on Family Ties?” Why would you not buy a book based on Family Ties if you saw one in the used book store?
“Well, you might have bought it back when it would make sense to buy a Family Ties book.” When would it ever make sense to buy an original novel based on Family Ties? Even when the series was on the air it’d still be a novel based on Family Ties.
“Hold on. You have an ironic book collection?” Well, not if the yard sale succeeds.
Make an offer. You can only get books like this by trying.