Explanation for english viewers:

Perla asks Sissi if she can have a bottle of water, because she has a sore throat. Sissi gives her a water bottle, and Perla actually refuses the bottle after looking at its name. Sissi is enraged by the fact that Perla can complain about a simple water bottle. This whole comic is a joke about the "Cristaline" brand and the russian dictator Joseph Stalin. In french, you could decompose the name of it to be Cri - Staline, which basically translates to "Yell Stalin". In the comic, Perla refuses the bottle, because not only does she have a sore throat, she doesn't want to yell things like that.

The reason why I didn't make it an actual comic, instead of a miscellaneous, is because the joke only works in french, that it's a political joke about Stalin, and that it mentions an actual brand.