when you pick up your bass and for some reason things just start moving real nice? I've been playing for about 10 years now, and I wouldn't say that fact reflects in any way my playing ability. I should be way better than I am. However, for some reason every couple years I have these wonderful breakthroughs where I pick up my bass and have an intense 30-45 minute stretch where everything just falls into place and I play like butter. Just improvisation, or some riffs I have been practicing forever. Something inside my hands clicks and I start grooving and man it feels great. Like someone flipped a switch or something.