I once flew into a Hulk-like rage after failing "Shout at the Devil" on Hard about ten times in a row (yes, and that's the easiest song in GH2 besides "Strutter") and hurled the guitar to the ground while screaming insults at it (after all, it HAD to be the guitar, not me). After that, the red fret button was kind of squeaky and grindy, and I could hear something rattling on the inside. Luckily, I've since replaced it.