Today was rather interesting;
QF SYD/MEL on an A330, Exit row. I was in 44A.
A rather large gentleman boarded in front of me and was in 44B.
During luggage stowing he dropped a couple of things and was unable to pick them up himself.
I didn't feel comfortable in that he was in the exit row, I know its not a 737 with a window sized opening, but even so I felt like it was a potential safety issue. Problem was I didn't have the foggiest how to communicate that in a way which wouldn't offend or cause a scene.
Luckily as it turned out i didnt have to, he required an extension seat belt. The QF FA who was very diplomatic explained that unfortunately no extension seat belts are allowed in the exit row.
The gentleman did protest quite a lot explaining that he has been allowed in other QF aircraft to sit there, and that other planes have bigger seat belts.
The flight was amazingly empty so he moved to two seats on his own, Issue averted.
If I had have been on a 737, there is no way I would have been comfortable with having that person there, but I have no idea what or how I would have resolved the situation.