I know that there is a thread like this every once and a while, and I think it is time for a new one. I am sure people have gotten better since the last one. It has to be a trick that you can do.
Mine is a three-way tie between Double D, Through the fire, and Spyderweb. They are all tricks that I have made up. Through the Fire is probably the toughest, but they are all pretty cool.