Maybe it's because of the way the sick boy's expressions and actions are depicted, which makes it humorous in a unique way.
The cartoon boy could be sick and funny because of a crazy virus that makes him act strangely and amusingly. Or it's just the creator's way of adding humor to his illness situation.
The cartoon boy could be sick because of a virus going around. Or perhaps he overexerted himself and his immune system weakened. Another possibility is that he was exposed to something harmful in his environment.
Maybe he caught a cold or had some kind of virus. It could be that he wasn't taking good care of himself.
The cartoon boy could be sick because he didn't get enough rest or ate something bad. Poor guy!
Maybe Charlee Brown ate something bad or caught a virus. That could be why he's sick.
It could be that he's been playing too hard and not getting enough rest. Or maybe he's stressed out from school or other activities. Parents are worried and trying to figure out what's wrong.
Maybe it's because the way the sick person is depicted in the cartoon is exaggerated and creates a humorous contrast with the seriousness of being sick and wearing a mask.
The funny cartoon character might feel sick because of a prank gone wrong, or it could be that it didn't get enough rest and now it's paying the price.
The reason is that it gives a unique twist. Funny sick cartoon characters break the stereotype and draw attention. It's a creative way to handle illness in a fictional setting and make it less gloomy.
Maybe he caught a cold or had some bad food. That could be the reason.