I know a lot of people have been developing and advancing theories as to why Luan turns into such a monster every April Fool's Day, and more often than not, said theories tend to conclude whatever happened to her was something that left some kind of psychological scarring on her at a really young age, and that her pranks and such are her way of dishing out revenge.
Believe it or not, despite Luan being my favorite sibling, I never really thought much about why she behaves the way she does on April Fool's Day, but seeing this old clip again makes me wonder. . . .
Maybe when she was really little, Lynn, Sr. (and maybe Rita) pulled this same kind of prank on her, and it just messed her up . . . I mean, look how devastated this poor kid is! Not saying Lynn, Sr. is this cruel, but I could see him pulling some kind of prank like this on one of the kids.