Related to what Dave's read, I read that on a strung and tuned strat (or tele, or any other bolt-on), that you can safely loosen the neck screws a few turns until it goes "crack" (not all do if neck already seated in the optimum position). Make sure it's lined up ok, then retighten the screws...
Idea is it gives you a better join, resonance, vibe, sex-appeal, chance of winning lottery... what ever your desire
I crossed my fingers and tried it - and much to my amazement it worked!!! The guitars are even in tune after the operation. I've done it to 5 fenders, 3 went "crack" and seemed noticably more "alive" afterwards. 2 were silent, and it made no difference to those.
One of the unaffected ones, my Roadworn, I've discovered has very tight screw holes in the body. Having said that, the neck/body joint looks very good and snug, sounds very alive as it is, so I'm not messing.