The B767-300 forward lav is unfortunately positioned very close to the CP. Even worse, there's something in the airflow that drags the stench forward. Early morning flights are the worst. Every fat pig is unloading 2 weeks of cruise-ship food, one after another.
The ONLY benefit of this setup is when you absolutely, positively need to sneak one free, you can always say "What the heck was Boeing thinking when they designed the lav and the airflow in this thing?!"
Even worse - relief pilot on a loooooonnnnnggggg haul all-nighter. Sitting back in 1C, trying to read, drink a coke, basically chilling. 90% of the people are asleep, and as everyone knows, one cannot control your slugs when asleep. Depending upon what was for dinner, putrid and rancid comes to mind describing the air in a cabin full of sleepers.
