Have you ever thought of making a drawing without even looking at the page? If not, then you should try it once as it can be a quite tempting and funny experience for you. When you don’t look at the page you don’t have any idea about what is exactly happening on the page.
You can draw whatever you like to. However, it does not mean you should start doing crap. Just keep an image in your mind and start drawing it on the paper without looking at it. This can be an unforgettable and one of the funniest experiences for you by all means.