No 4. A car coming in from X feet away to a point A crosses the point before another car falls in from X feet above

A high-budget commercial busted! Hats off.

[youtube]http://www.youtube.com/watch?v=c_IxU7Q4eoE[/youtube]

No 3. Two trucks colliding at highway speeds can hide can fuse a car

This one makes me remember the matrix reloaded

[youtube]http://www.youtube.com/watch?v=lEIqwZHUt7s[/youtube]