I get tears in my eyes ridiculously often during shows so I won't bore you with a list of those times.
I cry during 'I'll Cover You (reprise)' but the most upset I have ever been was recently in Billy Elliot, during the song where Billy reads his letter to his mum, and from then on, I was in floods, and when the miners descend into the ground, I new wave of tears hit me. It was reminding me of my own mum and her father (who was a miner) and I just got incredibly emotional. Many people in the theatre were sobbing, and you could hear people sniffling all around the audience.
"Jane, I've been dealt a blow - I've been dealt a blow, Jane."