In reply to johncoxmysteriously:
Well, 'just stand up' when they have been desperately trying to do just that for the past 20m+ is always popular!
'You're nearly at the crux now!"
"XXXX flashed this earlier!" where XXX is someone who has only been climbing for 6 months and can't normally climb anything more than the stairs.
"It's supposed to be soft..."
"Is it my turn yet" always draws great annoyance
It has been said before but the response "up" is great for "Where do I go?"
"Have you seen the little crimp to your left?" When they have been trying to hang onto it for past 5 minutes
"You haven't even tried yet!"
"Dyno? I can reach that static!" causes great annoyance
Best one ever was watching someone cruise a bouldering problem I had been unable to get off the ground on - in trainers! Needless to say my next attempt resulted in finishing it easily!