Enter World 7-8 with a Tanooki Suit. Go down the pipe that leads to the room containing a Hammer Suit. Hit the giant Question Block to sprout the Hammer Suit. Stand in a place where you think it will bounce on you, and press Down and B to turn into a statue. If you get the Hammer Suit while you're in statue form, you will be Hammer Mario, but gray! The bad thing about this cool bug is that you can't go up the pipe at the end; you're stuck in the secret room.