When free isn't free

A conversation held today at a comic book store between an employee and me:

"Would you like a free comic book?"

"I don't know. What is it?"

"I can't tell you that."

"Okay. Uh, all right."

"It's Witchblade."

"Aw! You bastard!"

"Sorry. Look, you don't have to take it, it would only defile your other comics."

"Thanks."