(Mr. Burns tries to show Bart that his family doesn't want him anymore, via a TV monitor...)
"Homer": (stilted delivery, not Homer's voice) I do not miss Bart at all.
"Marge": (not Marge's voice) I am glad he's gone.
"Lisa": (monotone, almost Lisa's voice) As am I.
"Homer": (drops a sandwich) B'oh!
Bart: It's probably my imagination, but something about them didn't seem quite right.
Mr. Burns: Really? Excuse me for just a moment.
(He walks into a nearby room where a set of the Simpsons' living room has been set up)
Mr. Burns: People, that was all wrong! Homer Simpson doesn't say "B'oh", he says... (checks script) "D'oh!"
("Homer", "Marge" and "Lisa" pull off their masks, revealing themselves to be actors)
Homer actor: (looks like Michael Caine) Sorry, M.B., but I'm having trouble with this character. Is he supposed to have some kind of neurological impairment, like Rain Man or Awakenings? I mean, what the hell am I doing here?!
Marge actor: And this dialog has none of the wit and sparkle of Murphy Brown.
Lisa actor: (Estonian accent) Hey, you know we are getting into golden time.
Mr. Burns: Yes, well, just get it right, or you'll all be doing Come Blow Your Horn at the Westport Dinner Theater!
(walks back to the control room)
Mr. Burns: (to Bart) All right, let's see what the old Simpson family is up to now.
"Homer": (drops sandwich) Duh-oh!
Edit
S 23 : Ep 12
Aired 1/29/12
S 23 : Ep 11
Aired 1/15/12
S 23 : Ep 10
Aired 1/8/12
User Score: 5240
User Score: 3796
User Score: 2913
User Score: 1501
User Score: 1367
User Score: 1154
User Score: 1011
User Score: 579
User Score: 561