I have never hidden the fact that a large wooden paddle is my favorite implement to use when a hard punishment is required.  Part of it may be the fact that I grew up in schools where a paddle was used, I think implements from our childhood always tend to stick with us as we become older spankos.  The main factor is that a paddle achieves the desired results so very quickly.  While I never apply a punishment that consists of just one swat, if there is an implement that has the biggest chance of teaching a real lesson, with just a single swat, it is the paddle.  A paddle covers a larger area than just about any other implement and has the ability to hit with great force.  Take a look at the gifs below and judge for yourself how very effective a single paddle swat can be.