It's pretty straight forward -
If the ball hits your head and then your arm in the first 19 mins of a game, but doesn't touch your left knee, then it's handball. however, after 19mins if the ball bounces twice then you kick it and the ball flies up hits your chin then catches the bottom half of your left arm then it's it's a red card for the goal keeper up the other end.
If the ball hits any part of your arm, in the penalty area or not, and a pigeon flies past then it's a stonewall penalty.
I don't get why it's so hard to grasp.
What if the pigeon takes a shit in your mouth like Ashley Young but the ball hits your hand, is there any leniency?
View: https://m.youtube.com/watch?v=LoZXEbo96Lg