Ian McKellen: Please, take these free tickets to my play!
Homer: What? What play?
Ian McKellen: We thespians believe it's bad luck to mention the name of this particular play out loud.
Homer: You mean 'MacBeth'?
[a car splashes Ian McKellen]
Ian McKellen: Quiet, you blundering fool! You'll curse us all!
Homer: What, by saying 'MacBeth'?
[an anvil falls on Ian McKellen's foot]
Ian McKellen: OW! Stop saying it!
Homer: Saying what?
Ian McKellen: 'MACBETH'! Oh, now I've said it.
[McKellen is hit by lightning]
Bart Simpson: This is cool! 'MacBeth', 'MacBeth', 'MacBeth'.
[McKellen is hit by lightning each time Bart says 'MacBeth']
Marge Simpson: Bart, stop saying 'MacBeth'!
[McKellen is hit by lightning]
Lisa Simpson: Mom, you said 'MacBeth'.
[McKellen is hit by lightning]
Homer: Mr. 'MacBeth', I'm really sorry.
[McKellen is hit by lightning]
Ian McKellen: That's quite alright. You didn't know.