I'm such an idiot.
I've just been doing a little extra fettling on my recently purchased cheap Precision. I decided to give the trussrod a little tweak now it's had Chromes on for a couple of weeks, and then set the intonation properly, it was only roughly done as I knew I'd be tweaking once settled.
Anyway I slackened the A and D strings and popped them out their nut slots to allow room to turn the allen key (headstock end adjustment), gave it a quarter turn and popped the strings back in their slots.
Reached up to the D string tuner and gave it a couple of swift turns to put some tension back in the string and the G string exploded.
Yep, that'll be the G tuner I was turning, not the D.
D'oh!
Anyone had any similar D'oh moments (D'ohments) when afterwards you think, how did I manage to be so stupid?
ππ