I needed vallium the last nativity I had to do - never mind wine.
Angels, despite banning wings because of the miniscule village hall stage and the fear of some kid turning around and knocking one of the others off it with mahoosive wings... at least 5 showed up with them on.
Innkeeper number 2 - refused to bother to learn his lines. Eventually he was set upon by three irrate inkeepers wives who refused to let him out of the corner they boxed him into until they'd taught him them!
Shepherds - after being appointed a shepherd, one little lad announced he was going to borrow his dad's cattle prod for his costume... farm apparatus had to be banned from costumes in anticipation of the cattle prod showing up in school.
Shepherds - to stop them twirling the sheep above their heads by their legs, we put them in a box by the stage for the kids to collect as they went on stage... they forgot and I had to chase them on stage to give them the sheep to hand over (mass hilarity at that one).
One reception lad who enjoyed his moment in the limelight so much he refused to leave the stage... thank God for the very with-it Y6 who spotted what was going on and firmly led him off by the hand!
After hours of discussion about these precious gifts the wise men were bringing and how they'd hand it over really carefully and bow... wise man number 2 proceeds on the night to lob the box at the baby, nod and almost head-butt another kid in the process and jump off the stage.
WHY IS IT ALWAYS MY CLASS THAT PROVIDE THE COMEDY RELIEF?!!?!?!
Least we didn't have any complaints about our choice for Mary - we only HAD one girl in year 6!