Check this little demo track out. I recorded this (several years ago) when I got my nitefly and wanted to see how the whammy bar was -- my intonation was a bit off here and there as I've never messed with whammy bars much.

http://www.station185.com/kronoson/kronosonic/Demos_Sounds/Behind%20the%20Moon%20by%20Bofatron.mp3

At time position 2:30 to about 2:45 it sounds really strange...I got that by hammering on and off with the bar nailed down to the body of the guitar

http://kronosonic.com