You'll need some supplies before you get started: a beancan, a door, and some tape. We recommend using duct tape for this project, but any kind of strong adhesive will work.
First, clean both the beancan and the door so that the tape will adhere properly. Then, cut a piece of tape long enough to wrap around the circumference of the can. Place the can upside down on the floor, and affix the middle of the tape to the bottom of the can. Wrap the ends of the tape around to cover the sides of the can, then press them firmly against the door.
That's it! Your beancan is now stuck to the door.