I'm starting to think that they are sniffing onions or pulling nose hairs to generate those tears. Maybe they are just really good actors who can cry on command, but it is suspicious that it is always the same moments where the tears flow.look here
more confirmation that everything they say in the concerts is scripted
They have a sign in front of them telling them exactly what to say...even the indication "wait for the audience's reaction"
we discussed before how they usually cry during the same moments of the concerts, so thats probably scripted too