First of all, when marinette,or ladybug goes into pixelator's house she sees all of the pictures of jagged stone on his wall and says, "this isn't creepy at all" sarchasticly. And my reaction is like: You have pictures upon pictures of Adrien all over your walls, and this is creepy? Pixelator has less pictures of jagged then you have of Adrien.
Another time of marinette being super dense was in the Mr. Pigeon episode. In the episode while ladybug is fighting with Chat Noir, he sneezes and tells ladybug it's because he is allergic to feathers. (Take note!) Then during the contest when mari wins adrien sneezes because of the feather in her hat. Adrien explains that he is allergic to feathers and all marinette says is quzuintite??!!! Srsly?! And his father still makes him wear the hat even if he's allergic to it?! Way to show your love agrestte! Anyways, I got to go! I love this show so much! Bug out!