Impossible! I walk on our local greenway nearly every day and it is NEVER the spandex-clad Lance Armstrong wanna-bes that bother to say “On your left”!
My dad played golf from the age of 10 into his early 90s. Never in his entire life did he ever purchase a golf ball. He would go out in the rough and gather up abandoned balls. Our basement used to have buckets full of golf balls!
In hotels I am usually just flipping 10 different light switches in a vain attempt to figure out which one controls a particular light!