Super Mario Maker: One Way Pipes!

In Super Mario Maker, there is no official way to create one way pipes. However, this can be done easily!

First, place a pipe. Then, place Mario inside the pipe, to make it a warp pipe. On the pipe Mario should not be able to enter, place another pipe, so that they cross each other, but in the same location. Mario can't enter the pipe with a sideways pipe on it!