It's inherent, in boys, to do boy things. Without ever seeing an example, Mr. Kimble chose this little car out of his supply of toys, and started pushing it across the carpet. It entertained him forever. It has a neat clicking sound that gets demonstrated when the tires move across the floor. It's chunky, and therefore easy to hold on to, especially since the mover is on all fours himself. Plus, it has bright and fun colors. I think I might have to find some more chunky cars for my little guy to play with. It'll be even more fun, if I can teach him how to say "Vroom!".