I first saw this ad 9 years ago and remains one of my favorites… most of us would not have seen it… it is now easy to access videos with youtube.
Mac Ad – think different – apple
The script of the ad goes like this
” Here’s to the crazy ones.
The misfits.
The rebels.
The troublemakers.
The round pegs in the square holes.
The ones who see things differently.
They’re not fond of rules.
And they have no respect for the status quo.
You can quote them, disagree with them, glorify or vilify them.
About the only thing you can’t do is ignore them.
Because they change things.
They push the human race forward. And while some see them as the crazy ones, we see genius.
Because the people who are crazy enough to think
that they can change the world… are the ones who do.
Shrikant's Blog 
Lovely ad! Had read the script before but watching the video for the first time. How old is this ad?