Hat wear and aneurysms

I've not seen Baxter or his slightly smaller associate, the prickly Ivan Ivanovitch, who I think is most definitely a beaky cap aneurysm with the personality of a Saltwater Crocodile who wears his beaky cap backwards. Baxter, a congenial Hippo of an aneurysm, wears a pork pie hat and he's proud of it. The question: what's Ivan trying to hide.