When Do You Get Your Best Ideas?

I find this fascinating.  We have been taught for years that if we get people together and discuss ideas, and brainstorm ideas, that we will come up with better ideas.  We have heard that "two heads are better than one" and other cliche's like that.

But is it true?  Some days it is...and some days not so much.

Here is an article where the author posts another process that makes some sense to me.

So first, where do you get your best ideas?  Second, do you think this process makes sense?