With the Apology Nifty Note, Knock Knock has taken the difficult, awkward act of apologizing and made it as easy as a memo note! Now, by filling in the blanks, you never have to actually “say” you're sorry. Defuse conflicts and avert pouting. Modern-day etiquette for the masses. 4 x 5.25-Inch , 50 sheets. Knock Knock is an independent maker of clever gifts, books, and whatever else we can think up. Our mission is to bring humor, creativity, and smarts to everyday life. Put the fun in functional with Knock Knock stuff.