Ah, the old " I need an upgrade for medical reasons" sketch..didn't work last time someone tried it on me either ....
Lady Pax complains to CC that her husband has a breathing condition and gets claustrophobic in an economy seat ( BTW husband said nothing throughout all this), CC member involved brings problem to us on the Flight Deck.
Me to CC : "OK, we'll consult our medical advisor's and get back to you"
........One phone call and several minutes later, I enter the fray at the door.
Me to Lady : " Sorry, our advice is your husband cannot travel.."
Lady Pax "Oh but he would be OK in Club"
Me " Sorry, you're not now cleared to fly at all, we need to offload you and you need to get your husband checked out before trying to fly with us again".
The look the husband gave his wife as they walked off the aircraft was priceless.