What if Sanji confessed his feelings for Usopp on Usopp's birthday (because it's a special date and it just makes sense to him) but Usopp didn't believe him because it's also April Fools and he thinks Sanji is playing a prank on him. And Sanji keeps on trying to make him realize it is true and he is not joking but Usopp keeps laughing. Until, of course, Usopp thinks he is being cruel and says it's not funny at all if he keeps going with the joke and it actually hurts but Sanji cannot make him see that he is really in love with him (<- Sanji's ass didn't know it was April Fools).
In retrospect, the collective tendency of DDLC fans to flanderize (and, oftentimes, infantilize) Sayori as genuinely stupid is rather frustrating.
I'm gonna try and stop short of this being an actual essay on her character, but I think most people are aware of the brand of flanderization I'm talking about without me elaborating on it. The thing to it is that she explicitly plays up her own airhead tendencies on purpose, partially for comedic effect in an effort to make other people laugh, partially to avoid other people worrying about her more serious problems (disguising anxiety with stupidity), and partially out of an inferiority complex.
Sayori clearly demonstrates that she's actually a very receptive and (barring some obvious issues) emotionally intelligent person. She's very effective at helping people; she showcases a great deal of understanding of the other club members during the side stories in Plus, sometimes beyond what they're even able to identify and express themselves.
I think the part of portraying her as a genuine idiot which aggravates me more than the fact that she's obviously more intelligent than she lets on is that an essential aspect of her character and why she acts the way she does is her incredibly low self-esteem. She near constantly sells herself short. She's exceedingly aware of how much of a fool she looks like, and incidentally, it becomes a self-fulfilling prophecy.
The reason she has trouble taking things seriously is because she values herself so little that she doesn't think she can do anything without making things worse. She gives up on things before she even starts them, and as a result, her belief that she really is an idiot who can't do anything right which everyone else has to put up with is reinforced, which makes her feel even worse about herself.
Yet these clowns don't even portray her as being in on her own joke. Pathetic