Reminds me of a woman who sat next to me on a flight recently. I didn't notice the arm rest was up. When it was time to take off, I tried to lower the arm rest. I kept pushing and pushing, raising it, and slamming it down, not realizing that it was hitting HER. I actually felt bad for her, she had a look of horror on her face, and just sat there staring straight ahead. I just left it up at that point. It was only a 2 1/2 hour flight, and didn't kill me, although I am uncomfortable touching people I do not know, and our bodies touched from legs to upper arms. If I had been in a sour mood, I might have made a fuss, but mostly I do not like to cause issues, and embarrass people. With what I consider a relatively lenient COS policy, I wish more people would take advantage of it.