Luann: The moon was full and the front door was wide open.

Yep, definitely top 20. Almost certainly top 5, in fact. Here's a list of disturbing shit going on in this Luann storyline:

1. Luann has seen Gunther naked.
2. Luann keeps making flirtatious remarks about it.
3. Luann keeps making flirtatious facial expressions behind Gunther's back.
4. Gunther's legs are kind of beautiful.
5. Gunther is wearing a worm costume...
6. which signifies his emotional state.
   
7. Gunther's worm costume makes it appear as though he has a giant fucking cock.
8. Luann used the phrase, "The moon was full and the front door was wide open." I'm not entirely sure what it means, but I never, ever want to see it again.