Unusual cool bonus DVD/BluRay content you enjoyed.

I started a thread using Amadeus as an example and that got me thinking about the last time the studio cut of the move was released, which was on DVD. One side had the regular movie while the other side had the movie but only with the music as an audio track ; no dialogue or sound. Pretty cool and unusual.

What other cool and pleasantly strange bonus content have you enjoyed?

 

All I can think of is the Beatles 2009 CD box set that came with a little 5 min. video of each album. Something you pretty well watch once and kind of forget about.

 

I thought the option to watch Momento in chronological order was a pretty cool bonus feature. Those menus were interesting too....full of puzzles and memory games to complete in order to access the features.

 

I agree, and wish the Blu-ray had this feature.