I have a horror story, actually two. During the test this kid sitting next to me was marking up his LR, RC, and LG sections with different pencils. Using different pencils wasn't the problem, they all were sharp so every question he marked, the sound the pencils scratching against the paper was the issue. If it happens occasionally fine, but not every section. The RC was the worst.**Scratch** **scratch**. I felt like the character in Poe's Tall-Tell Heart. He went through a lot of pencils. It was driving me mad, everytime I started to read a question I'd get thrown off by the scratching sound of his pencil. Also he had a cold an blew his nose rather obnoxiously. I guess that is the problem with prepping in silence, on test day it may not be so silent.
My girlfriend was in a different room, but she sat next to a guy with a cold who blew his nose loudly and another guy who kept farting (silently and tooting) throughout the test. Both are terrible experiences. But, the actual test was okay I suppose.