my experience 1: since i'm tall, my head sometimes block back ppl. I admit it. There was once when there was a small kid (7-10 yrs) sat behind me. He keep tickling my ears, i know he wants me to go lower.

my experience 2: this is what i SAW with own eyes. at cinema at the curve. malay people acting kampung style.
they put their legs up on the chair in front and dig their toes. nobody sitting in front of them that time!