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"Do Not Block Intersection" signs
"Pay what you can" charity shops.
In the U.K. We have 'smart motorways', which controls speed limits and lane closures when traffic backs up or if there is a blockage in one lane.
It's run by fancy computers with clever algorithms and such, and if you reduce your speed or change lane when directed, you won't get stuck in the traffic. But people won't be told, which means while I'm slowing down to 40 the dick next to me carries on at 70(or more) and adds to the chaos further up when s/he hits it.
This is what causes 'phantom traffic jams' (where traffic slows down without any obvious cause, or miles ahead of the cause) and is exactly what the smart motorway system was designed to prevent.
But people are stupid AND impatient, so it doesn't work.
Selling on Craigslist.. nowadays people either ridiculously lowball you, or flake out because they think you want to rob them.
I remember when NFL Blitz came out in the arcades the cabinet had a built in N64 memory card reader so you could transfer your stats. I excitedly brought my memory card later that week only to find someone jammed gum inside the reader.
When JC Penney did away with sales and priced their merchandise honestly, they almost went out of business.