The top image from today's AOTD showing the steps of production reminded how useful the animated GIF is in demonstrating how a car works. What's the most educational automotive GIF out there?

I'm partial to this image showing just how those crazy rotary engines work. All it's missing is the part where the apex seals get pushed out.

What's The Best "How Cars Work" Animated GIF?(QOTD is your chance to answer the day's most pressing automotive questions and experience the opinions of the insightful insiders, practicing pundits and gleeful gearheads that make up the Jalopnik commentariat. If you've got a suggestion for a good "Question Of the Day" send an email to tips at jalopnik dot com.)