I know the images portray the silent movie indications of a heart attack rather than a stroke, but some things you chalk up to artistic license. Actual strokes don't sell the joke. I also realize this is a morbid subject for discuss cartooning process.
So, why Batman? Well, this involved a call back gag, Batman popped up in several Fun Strips within the same batch, so I threw him into this one for the last of the different folks. It works in or out of context, because an ailing cartoon Batman is, like a monkey, always funny.
Unless it isn't. These things are, of course, subjective.