"The Regina Monologues"
First Aired Sunday
23 November 2003 at 8pm
Fox (US) Network

Homer gets the 'royal treatment' from guest stars J.K. Rowling, Prime Minister Tony Blair, Sir Ian McKellen, Evan Marriot (all playing themselves) and Edwina (guest star Jane Leeves) when The Simpsons visit London.
The scene opens with the marquee in front of a London theatre . . .
Ian McKellen, in costume as Macbeth, steps outside . . . "
where the Simpson family is waiting.
He invites them to see his show, the name of which cannot be spoken without incurring really bad luck.
Homer, naturally, cannot help but say the name, and an anvil falls from the sky, landing on Sir Ian's left foot.
with electrifying results . . .
Electrifrying!
Somehow, like all good cartoon characters, Ian survives this onslaught . . .
only to be seriously crushed . . . .
by a falling theatre marquee.