loneliness
"People think they know me, but they don't. Not really. Actually, I am one of the loneliest people on this earth. I cry sometimes, because it hurts. It does. To be honest, I guess you could say that it hurts to be me." - Michael Jackson
"Dear Maths Students,Please don't try to find us, we owe your teacher money.Sincerely,X and Y."
