This may work with many different objects. Do the Walk on tables glitch after putting an object, like a luigi trophy, on the table. Pick up the luigi trophy and then put it back down and press B. You have to have very good timing to do this. If done correctly, you'll pick up the table, and the trophy will be floating. The item will act just like a table! Drop an item over it and it will float high above it. After you leave and come back, the items may switch places.