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Our playful take on this old-school classic combines witty well wishes with colorful animation that seems to pop right off the page. Obviously, it's a flippin' great way to tell someone they're the best. Your BFF will flip out over this book. Interior reads: You're the greatest person on the freakin' planet. Paperback, 208 pages; cardstock sleeve. Knock Knock is an independent maker of clever gifts, books, and whatever else they can think up. Knock Knock's mission is to bring humor, creativity, and smarts to everyday life. Say something more with #knockknockstuff.