Some things that E-boi sometimes tells me to get me irritated does good for me. The other day, when I was playing a Dave Matthews Band riff, he said I can't still play the 'So Much To Say' riff. That's it. I wanted to prove him wrong by learning it. I did that in a jiffy. It came so easily.
And I love it. It is simply amazing how people like Dave Matthews and John Mayer find the G-spots for riffs on the guitar.