Previously in this series: Not Allowed In The Deep End -- Ralph Wiggum. The world owes a great deal to minor Simpsons characters, and I have taken it upon myself to periodically-yet-irregularly celebrate them as the spirit moves me. Today we honor Edna Krabappel. There's a scene in Some Like It Hot where Marilyn Monroe's character (Sugar Kane!) smiles heartbreakingly at Tony-Curtis-as-Josephine and explains why she's running away from men: I'm not very bright,…