You_Too said:

Life of Pi had different aspect ratios, and on top of that it had some stuff move out over the black borders sometimes!

I'm kinda torn on if this qualifies, personally. If there's content outside the frame, then it's not really fair to call that the frame, is it? Yeah, it's a bit of a pedantic distinction, but still...

Not that it wasn't a neat effect (and a reminder that 2D depth effect tricks can still be more effective than stereoscopic ones). Ang Lee has tried before to bring comic book inspired visual tricks to the big screen, and this effect worked out much better than most of the things he did for Hulk IMO.