30 years ago, Eric Idle of Monty Python and a group of similarly funny blokes put together a send-up of The Beatles, called The Rutles. Saturday Night Live producer Lorne Michaels got wind of it and put the money behind the idea, resulting in the classic movie All You Need Is Cash.
If you haven't seen the movie, find it and watch it - it's hilarious. Loads of great cameos, including George Harrison.
The pre-fab four got back together last month to celebrate the 30 year anniversary of the movie. Of course, it's not the first re-grouping. They put out the inferior Archaeology CD a few years ago.
There were some articles and interviews around the anniversary. Good ones here and here.
And from the original movie, check out these classic scenes: