Unfortunately I had many horrible trips, mostly due to cramped seat layout.
The worstest was Azzurra Air 737-700 from ACE
I was seated in the last row, in the middle seat, between two very big men.
The flight took off at 1.30 am and arrived at 6.30am.
Another one was with Tunisair (727-200 MXP
-DJE), really cramped!!
Then KLM 743 AMS
Seated in the last row again, but with a window seat. The space between the seat and the wall (bigger than in other rows) was very uncomfortable and makes the window not usable if you stay seated. At that time, that section of the aircraft was a smokers one, and I don't smoke (but my mother does.....)
But these are only the highlights.
I can say that all the charter flights originating in Italy are horrible (seats, children and their mummies, talkative people, etc etc)