Song intros that really grab you? ?

Perhaps the most recognizable intro is the opening chord played by George Harrison's 12 string Rickenbacker on "A Hard's Day's Night". For years controversy has existed over the actual chord whether it is Gm7add11, Gsus4, or G7sus4. It makes me smile every time I hear it.

The Youngbloods had nice intros with at least two songs that I favor, 'Darkness, Darkness' and the song, 'Let's Get Together'. Friend and lover had a great intro with 'Reach Out in The Darkness'.

I revisited this thread and looks like the winner here thus far is the intro to the Beethoven's Symphony No 5 which is mentioned more times than any other intro.

It sure is a classic and probably more widely known/remembered intro to a much wider audiance and not just audiophools.