Looks more like he was scratching himself on the roadside berm, slide partway down and was high centered on it. After struggling and sliding the rest of the way down, he was able to get up again and follow the herd.
Obviously Starbuck's lawyers are going to win, as they should, because (while perhaps equally stupid and disgusting) that is clearly not at all the same drink and it's hardly like that cafe came up with the idea of a unicorn.
I'll start the boring part by suggesting that the body shape and behavior are consistent with a caterpillar of an underwing moth (probably catocala spp.)
If you're going to do this properly, you should wrap just half your teeth and leave the other half untreated as a control for comparison. We'd like to see that followup photo.
and I agree something like this ought to be a standard equipment item