I'm not sure exactly what happened, but how Myles from Alter Bridge dealt with it was amazing!  During "Ties That Bind" in Hamburg, Myles needed his guitar for some parts of the song.  Did he forget to put the guitar on for the song?  Did the guitar tech forget to get it to him?

Either way, when he hits the point of the song where he had to play, he air guitars and sings the part!  You can tell he and the crowd were having a good time with it.

Better than getting pissy and storming off stage!