I did.... on the beach... like other 3 persons... xD

who hasnt

I did. In my house and in the school, but nobody see me.

lol , what anime is this from ?

Gintama, which includes many parodies from familiar anime series and not just DBZ.

EVERYONE HAS TRIED TO DO IT i still try. I did what gohan told videl on how to bring out ya energy and nothing happens. Sucks

Pft, ***** please.
I tried to do a Spirit bomb on the teacher who was giving us all detention because one twat thought it was smart to talk back to the teacher after being told off for swearing.
I raised my hands and asked the rest of the class to lend me their power :V

What? I lived an eccentric childhood...

When i was much much younger i did.

And powering up! Hurt my throat so much those days... lol

I gotta say, I hate people who criticize the whole "Scream to power up" thing.
How many buff guys have you heard being silent when lifting heavy weights?
How about when you try to lift something heavy.

:V

I remember trying to copy Gohan teaching Videl how to fly once.