Carpenter John Heisz cut through wood using a saw blade made from a single piece of printer paper. Heitz built up to the cut by first tearing through a different sheet of paper and a piece of cardboard packaging.
This redefines “paper cut”, I guess. And while this really doesn’t have any practical applications, it was interesting to do. Even more so, since the paper I used was nothing out of the ordinary – just regular printer paper with no special treatment. Add to that the time of year (it was hot and humid, making the paper fairly limp with moisture), it’s amazing that it worked at all.