not a guitar, but the singer from my band jumped on my bandit trying to surf it, wiggled it a little bit (to shake the reverb springs) , and then came down with the amp. We ve got a singer down, plus a few missing knobs on the amp, but it kept working. As for guitars, i ve never done it, but i don t mind a few dents on them either. Most of them are not done on purpose though. Plus i don t think i ve got enough strenght in me to break a fender.