Sewer levels... they are ALLWAYS the worst part of any game...
Also does anyone remember the wall of death chases in old 2D games?
You know.. where you where followed by a deadly wall of spikes/lava/water that killed you on touch all the while you had to navigate through jumping puzzles involving moving platforms?
I HATED these sections with a passion... good thing that this type of level design has almost completly died out.