In a campaign that is about to start one of the PCs is a Flux-Storm Chaser and Experimenter. Flux (also called Torque) essentially messes with reality and can cause all variety of odd effects to happen, from mutations to absolutely bonkers stuff.
Well this character has a Arcane Familiar that is a cat named Schrödinger. This cat has seen its fair share of the Flux, as such over the course of the campaign we are going to do anonymous draws to see what weird effect will happen to the cat next. Be it growing another eye, going invisible, coughing up fire, etc.
As such I turn to you ENWorld and your collective minds to think up the most off-the-wall bonkers ideas you can for the cat. Remember too, the cat is essentially the comic-relief for what will be a fairly serious campaign so go as silly as you wish.