It's so funny that he bottle-brushes his tail when eating. My panthers only bottled-brushed when they were super freaked out, so like twice in 10 years.
He does it all the time! He actually does it just when excited in general. Birds, playing, us giving him affection, all of them cause a bottle brush. I just uploaded a video recently of him doing it to us giving him pets. He's super hyped.
I was really worried that a tornado was coming for a bit... but ... that's just how your very round cow cat sounds I guess? Like a warning siren. Take cover!
While Moo's antics are hilariously exaggerated, it seems obligatory for cats to do this sort of thing. My cats jump on to the counter to watch me do anything, making coffee, cutting vegetables etc, but when I feed them it's the same climbing up the legs behaviour. Cats are weird !