Is it even possible?!?

[Neerb]

Alright, I've heard here and at GameFAQS that you can go from Samus to Zero-Suit Samus by pressing up and down on the control pad (aka up and down taunt) really fast over and over, but I've never been able to do this.  Last night, I tried for thirty minutes just doing Up-
Down-Up-Down over and over and over again, and nothing ever happened!

Has anyone here ever actually pulled this off?  If so, please give me some advice on how to do it.

[jnfs2014]

you have to do it really fast.

http://www.smashbros.com/en_us/gamemode/various/various38.html

2nd down in chartacter.

[Mutilator7]

Check youtube, i've seen a video of it done here.
http://www.youtube.com/watch?v=DzEivwIfyEQ

[Macawmoses]

As noted, it is more than possible, you just have to hit the taunt buttons in the same manner that you would to activate an Easter Egg, such as the Lylat Cruise EE. You can also do it at the beginning of a match by holding L + R when selecting a stage. To my knowledge, though, it doesn't work in reverse, without a Smash Ball.