Knock Knock LLC

The product is a funny bathroom guest book novelty toilet sign-in book with an aqua gold hardcover. Published by Knock Knock in the 2010s, this book is intended for adults and features the signature style of the Knock Knock authors. The book serves as a unique and entertaining way for guests to sign in and leave humorous or heartfelt messages in the bathroom. The hardcover format and aqua gold design add a touch of elegance to this amusing addition to any household. Combined shipping with other items listed.