Teach Siri

One frustration with Siri is it not recognising some pronunciations, whether to do with accents or unusually spelt words.

Wouldn't it be cool if there was a 'Teach Siri' option – either from a contextual menu on a selected word, or within Siri – that allowed you to record the way you say the word so that Siri would understand you.

What do you think to this idea? Would you use it?