Dammit, where's Zombie Jonathan when you need his expert opinion?
Tortoise Identifies, Only Headbutts Black Shoe: The Foot Clan!

Presumably as part of its tryouts for the Ninja Turtles, this is a video of Tommy the tortoise inspecting a line of shoes (including a black shoe with white tape on one side) before making his way around to the other side of the line and specifically headbutting the black shoe. Why does it only attack the black shoe? Your guess is as good as mine, but I suspect it involves the Foot Clan. Or maybe — MAYBE — the hare was wearing a similar model during their infamous race. “Haha, I wore Keds and still won!” I imagine Tommy taunting the shoe before slowly losing interest and looking for some lettuce to snack on.