I just heard about this silly glitch...

[Strawberry Cumbustion]

It's called "Giga Jigglypuff". Here's a video explaining it: http://www.youtube.com/watch?v=RZwlGlKJ2eg

Basically, you use Jigglypuff's final smash while the Bridge of Eldin is being formed after exploding. If it works right, you'll get hurt and the final smash will be canceled, but you'll stay huge! Also, if the other player is Yoshi and he swallows you, you'll get even bigger. 8D  

[Strawberry Cumbustion]

 

[Hector18Falco]

umm it's true, i've done it a million times! It's funny...There's also this glitch where u use the golden hammer and if u press A while jumping it will stay in the air, but u have to press the A really fast and keep pressing it....it's...weird...XD  

[Animeboy887]

Hector18Falco

umm it's true, i've done it a million times! It's funny...There's also this glitch where u use the golden hammer and if u press A while jumping it will stay in the air, but u have to press the A really fast and keep pressing it....it's...weird...XD

i love that glitch  

[Sonic2Fast2See]

A friend from school actually told me about this one XD. its pretty funny and i do it like everytime I play as Jigglypuff (just for that part) But you can like hardly move because you'll wander too far from the stage and die XD  

[Shinycake]

Hector18Falco

umm it's true, i've done it a million times! It's funny...There's also this glitch where u use the golden hammer and if u press A while jumping it will stay in the air, but u have to press the A really fast and keep pressing it....it's...weird...XD

Actually the golden hammer isn't a glitch, it's meant to do that. I browse a lot in the official website before I got the game and before I got the Wii cause I knew I will get it. =P
And if Yoshi eats him/her they get bigger =D
EDIT: Let's make a subforum where we post glitches we find.  

[Prince Amaterasu]

do it on giant brawl, all you will see is the bridge, and pink  

[Dee_chef]

ok have you guys heard of the glitch with gray fox gray fox glitch click it and watch the movie lolz ive done it and it works and it is funny because every time gray fox falls it does 1-2 damage mainly 1 to your person you are fighting  

[Animeplay99]

Omg funny glitches, must try them out. x3