Bart: [on the phone]
Yes, Dad, I solemnly swear I will not tell another living soul.
...
No, not even Millhouse. [hangs up]
[intense, but brief, mental struggle]
[dials phone]
Hello, Millhouse? Can you keep a secret?
Millhouse: No.
Bart: Oh, well, who cares.
-- I've got a secret, "Stark Raving Dad"