This t-shirt is inspired by a common phrase that describes the feeling of being knocked off balance. It is a reminder to always stay on your feet and not get knocked down. Knock Knock T-Shirts is a t-shirt shop that offers unique and one of a kind T-shirts. If you love novelty then you will love Knock Knock T-Shirts. They offer shirts with witty sayings and humorous graphics. They also have a wide variety of colors and designs to choose from.