Murphy's Pedestrian-Perks Law
Refers to the infuriatingly-common "lousy timing" occurrence of your seldom encountering the usually-hoped-for opportunities/pleasantries (i.e., neighbors relaxing on their front porches/lawns whom you can shoot the breeze with on your way by, pretty girls to hold hands with and "chat up for a few", sizable numbers of discarded returnable containers, etc.) whenever you're out for a stroll or otherwise leisurely traipsing around your local area on foot, yet when you either hitch a ride with someone or are "a man on a mission" in your own vehicle and thus you can't "acceptably" stop to avail yourself of any of these assorted "sidewalk delights", the roadsides you travel along will either be "chock-full of friendlies" or "Bottle/Can City", and so you'll be mentally "climbin' da walls" at having to agonizingly pass on by all of those much-desired goodies.
It was foggy and chilly when I started out walking around town to complete my weekly errands-list, and so there was hardly another soul outdoors, but then sometime later when I was riding back again with a neighbor who'd offered me a lift home, the weather turned clear and balmy again, and there were lots of smiley-faced sundress-clad cuties strolling the walks all over town! Guess it was Murphy's Pedestrian-Perks Law at work!