Our company hosts an annual "Shark Tank" like event called FirePit. For this year's event, I was asked to create a teaser video to help drum up interest for the event. I was given the logo and a theme of "sailing ships" and was tasked with coming up with the animation in a week.
The project was created and animated all in Unreal Engine. Keeping it all in UE4 allowed me to quickly iterate on ideas, and stay flexible until the very end. As a bonus, the whole thing takes about 45 seconds to render, so I was able to always pump out full quality previews to the planning committee.