I found this kinda test on a site. Read it all without scrolling at first. It's unbelievable.
>This little test is something unbelievable,
> > > until you don't think about it.
> > > Then, it becomes even more mysterious.
> > > Just follow this instructions:
> > >
> > >
> > >
> > >
> > > DO NOT scroll the page too fast! - don't be
> > > hasty
> > > and follow this instructions exactly, don't use a calculator
> > > when you see the addictions
> > > and when you make the addictions,
> > > do them as faster as you can.
> > > Let's go...
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 2+2?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
>& gt; >
> > > 4+ 4?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 8+8?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 16+16?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Now be fast! Think at a number between 12 e 5.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Done?
> > > Now scroll the page.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > The number you thought is 7, right?
> > >
> > >
> > > This is no magic!!!!
> > >
> > >
> > > Try the
> > > next exercise, you'll be surprised, guaranteed.
> > > There's no cheat, it's a scientific fact.
> > > Again, answer to the questions, the way you did before.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 1+5
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 2+4
> > >
> > >
> > >
> > >
> > >
> > >
> > > ;
> > >
> > & gt;
> > >
> > >
> > > 3+3
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 4+2
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 5+1
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Now repeat in your mind the number 6,
> > > for 15 seconds, then scroll the page.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > NOW!!! THINK ABOUT A VEGETABLE! Then scroll down.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ; Even more down....
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > You thought about a carrot, didn't you? Otherwise, you
> > > are in that 2%
> > > of people whose mind is "deviated" enough to think about something else.
> > > The 98% of people will answer "carrot"
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Now count all the F in this text without using too much time:
> > >
> > >
> > > FINISHED FILES ARE THE RE-
> > > SULT OF YEARS OF SCIENTIF-
> > > IC STUDY COMBINED WITH THE
> > > EXPERIENCE OF YEARS.
> > >
> > >
> > >
> > >
> > >
> > >< BR>> >
> > >
> > >
> > >
> > >
> > > Done? If you are ready, you can keep reading
> > > ... OK?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Then? How many? Three?
> > > You sure? Or do you wanna try reading
> > > again?
> > >
> > >
> > > You'll find the solution by scrolling down
> > >
> > >
> > >
> > >
> > >
> > >
> > > The "F" in the text are SIX in total!!!
> > > It seems that the human brain, in fact, isn't able to
> > > elaborate the "OF"
> > >
> > >
> > >
> > >
> > >
> > >
> > > Who counted all the six "F" is a Genius.
> > > THREE is normal ... Four is already a bit rare.
> > > Affascinating, isn't it?!?!?
It worked for me and my friends. Now tell if it worked for you
P.S.: There's another piece of this test but it was in Italian and I didn't want to translate it (I already translated this one, and fast, so you'll find a lot of errors in it). If you like this one I can translate the other piece too