Smelly Socks
I recall several entries I made in the tech log re smelly socks (whether old or new but unwashed I know not) when on the 757. It seemed to occur for a minute or two on the descent passing about FL300. I am now too old to remember exactly what happened at 30,000ft but think it might have had something to do with the packs. The stink was fairly repulsive.
Prober