Or hot-headed, depends on what's inside them.

Either way, looks like Meddy's got a bit too careless with... something or the other (or, you know, getting pranked, or someone else messing with them; plenty of ways the cat tends to end up in these kinds of Situations) and ended up with a bit too much filling in that noggin, and everywhere else by the looks of it... the swelling doesn't appear to be slowing anytime soon as well- hopefully it does before they end up a bit too taut to get back down to size! Or end up all over the place instead, never an impossibility with 'em.

Something kinda quick (and kinda weird) I did on a whim after the idea got into my mind last night. You could say it's almost true to life, given I am fairly airheaded myself (self-admittedly so at least), though I'm definitely no balloon to speak of. _{As far as I know.}