IMHO, I think any line when homer utilizes his low, raspy whisper is comedy gold. I can't not laugh when i hear it.
ex:
To IRS auditor: "Can you pay me under the table? I got a little tax problem."
To Rod and Todd: "I'm sorry. Please, forgive me" (The fallout shelter ep.
Anyone got any more? I'd lopve to get the wavs from them.