I was quite impressed by Michelle Obama's speech in Soweto - until she invited the audience to recycle the famous chant from her husband's presidential election campaign.
I've suggested before that lifting words from someone else is a risky business, whether you're a presidential candidate borrowing from a British party leader (Joe Biden/Neil Kinnock) or a British prime minister borrowing from an American president (Gordon Brown/Bill Clinton) -see video clip under tip 3 HERE).
But is it OK if the words are well-known ones borrowed from your husband?
"Yes we can" was certainly appropriate enough in the context of what she was saying. But did it really work?
I wasn't entirely convinced that it it did, and would be interested to know what others think.