There should be an invisible wall of lasers extending straight up from the fence so that any ball that goes over it would be instantly vaporized. This would also curb fan interference. Whatever can't go up, can't go down. It sounds good and would feel even better. Make it an exercise in anger management.
Some people are afraid of strangers.
You need to have strangers in your life. People you can lie to or be rude to or not care about. It's very tiring to be constantly with your friends and family, where you have to be concerned about what you say and do for fear that they'll bring up unfortunate incidents from your past. It's much more therapeutic to be with new people who have never seen your employment record, your scars or your rap sheet. So when you hear about how fast the world population is increasing, don't despair.