Collisions is a seriously creative movie, most creative use of block mixing, track editing and replay editing. All combined into an excellent three-minute video.
What really amazed me about this movie is that the collisions happened from different angles, which gave it that real touch to it to make it look like there wasn't any special effects, just pure creative editing in the Media Trackers.
From my point of view, Bay and Coast had the best Collisions from multiple angles.
But in the end, it really got exciting when they showed us how they did it using enough block mixing and media tracker.
You should really check out Collisions here.