Smithers and Homer in “Homer the Smithers”

Montgomery Burns' office. Oh hello, Mrs Burns. I'll see if your son is available.

Homer

Mr. Burns has a mother? She must be 100 million years old!

[to Homer] She has limited capacities. All she can do is dial and yell. [talks back to Mrs Burns] I'm sorry, Monty can't come to the phone right now. He's in a very important meeting and can't be disturbed. [shot of Burns trying to avoid falling asleep] Uh-huh... okay, I'll give him the message. [hangs up] Mr. Burns can't stand talking to his mother. He never forgave her for having that affair with President Taft.

Homer

[chuckling] Taft, you old dog!