The thing I thought about doing it was it's Comic Relief and you've got to be funny. So although I did try to sing properly it obviously has hilarious results when you can't sing.
What other people call dark and despairing I call funny.
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Laurence Olivier said in an interview once that when he plays a tragedy he always aims for the funny parts and the other way around. Because in a comedy you look for what's serious. I think that's true. Sometimes things are really funny if you're absolutely earnest. If you're really serious it's hilarious.