You will need two players for this glitch. This glitch can be done by mostly every corner.

What I do is go in the help room when you have money to spend. Right when you turn towards the mystery box the cabinet on the left is next to the mystery box.

Go between the box and the cabinet and one person should go as far as they can between the cabinet and the box and should start jumping.

The next person should crawl under the player that is jumping. Once the player is under the other player you should stand up and you should be inside the player that was jumping.

Whatever you do, do not move your player!