Super Mario 3D Land Easter Egg - Infinite 1-ups (NOT an egg)

Go to level 4-1 and go to the river with about 5 goombas. When you are there use a fire flower on the koopa walking by the river, and keep using the fire flower to push him to as far left he can go. When you do that go behind the shell facing the water. Kick it and it will go back and it should bounce straight. Jump on the shell and you should get infinite 1-ups. You can even get over 1000 lifes!