Has anybody had this strange experience?  My guitar is sitting there on the chair, all by its lonesome, and I hear "BOINK".  So, I look, and the D string just snapped.  No one touched it, it is tuned perfectly and I don't have any little nosy children running around.  Also, the guitar is two days old, brand new.  What's up with that?

weak spot in the string maybe . or it was in a bind at the nut or the bridge . but most likely a defective string it happens although its unusual when not being played or tuned . could be the guitar rejects that brand of string out of spite.

Hi, and welcome to chordbook.

Sounds like defective string, or it was not installed properly and possably kinked somewhere.

I have heard of that happening in extreme temp changes but only on the high E and B strings, and especially the G octave string on a 12 string guitar.

Might also be a sharp spot in the nut or the saddle.
If it happens again, its best have someone qualified look at it.  And since you say its new, I would take it right back and tell them what happened.  Then see where it goes from there.

Thanks, Jag and Cricketrider for your help.  I'm on my way back to the store and  I'll have him check out the nut, since it looks like that's where it snapped.  (I did have a little trouble tuning that string.  It never sounded right.) 

I had a bridge come off a guitar once while it was sitting in its case, but it was because I put nickel plated steel strings on a nylon string acoustic.

Shaidtan, that's weird!  The strings on my classical are original nylon.

and they should stay nylon if you dont want that classical to cave in on its self
ive never snapped a classical string while playing but i feel like u wouldnt notice
till i fretted a chord that needed that string.
where as an steel string acoustic or an electric oh yeah you feel those break in
your hands
my biggest fears besides giant midgets and jumbo shrimp is a string snapping
and hitting me in the eye