Is putting pressure on the neck like Randy Rhoads did on the live version of Crazy train bad for the neck as long as I don't put too much pressure? I'm talking about the part before the pick scrape into the main riff the open a, then he puts pressure on the neck to make a dive sound.
I do it on my acoustic all the time, you may need some truss rod adjustments over time, but it hasn't hurt my guitar.
Once I did it and heard a little 'pop', but it didn't seem to hurt it any. It might have been because I have a bolt-on neck, and it may have wiggled. I don't know. Don' ask me these questions >_<