Oh dear!
I'm a bit of a giggler.
It's even worse when someone has the same sense of humour and you know you mustn't.
I've had that in a seance, and tucking a book into bed on a visit to a gurdwara. Luckily I didn't have someone their to really set me off, however if you do, it's almost impossible to avoid eye contact and sharing so much with just a look.
Trying to stop giggling if there are two of you , is even worse.
I suppose the royal family come across so much on their visits, even they can't help it sometimes.
They are supposed to be so formal and po faced.
Camilla and Charles share a lot, obviously a sense of humour. The feeling they shouldn't be giggling is doomed to make it worse, imo.
The royal family is just human.
I know exactly how they feel
