I really like the band The Police. I was checking out a site about their guitarist Andy Summers and his gear and I found one of his techniques: Chime harmonics.
Some of The Police live footage I'd see him do what I thought was tapping but it turns out he's doing this. It's cool because when you get the technique, you can pick exactly what note you want a harmonic of. It took me a little while to pick it up, but it's not too hard if you understand what harmonics are and have a little bit of technique - probably not for beginners on guitar though.
Maybe some of you know about this, but this is a first for me.
Here's the lesson.
http://web.tiscalinet.it/andatta/harmonicslesson.htm