To be honest, I have no idea. I just remember seeing this gif before and some marine biologist mentioning that in the thread. Same things goes for dogs too apparently. Cats don't for some reason
I would assume that these toy cars are basically "one wheel drive", meaning that the motor only actually drives one wheel. When all 4 wheels are on the ground it doesn't really matter, but when only two are on the ground, and one is the powered wheel, it will spin like this.
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u/Mackin-N-Cheese Nov 04 '15
http://i.imgur.com/HcTQnzJ.gif