From "The Simpsons: Sideshow Bob Roberts (#6.5)"
Bart, your mortal enemy's on the radio!
[Bart turns on the radio
It's time for more deeeeeeee-mentia, with Dr. Demento! And now, the funny five!
[Bart yells and throws the radio out the window
I meant your other mortal enemy, Sideshow Bob.
Sideshow Bob? Oh, I'm only ten and I already got two mortal enemies!