As my first car, I acquired the old Chevrolet listed below as a hand-me-down from my parents. Back when it was new, oil filters (bypass cartridge only) were an optional accessory, bolted on, and plumbed to the engine with two rubber hoses. By the time I got the car, the original hoses looked dubious, so I replaced them with new (non-GM) ones. A few weeks later, I used that car to move away from home to my first real job, hundreds of miles away.
During that trip, on a limited-access highway, suddenly oily smoke started blowing onto my feet, and smoke came from under the hood. Stopping and opening the hood revealed nothing but smoke, initially. A couple of guys pulling a boat stopped and came running with a fire extinguisher. Seeing smoke, but disappointed to see no flames, they pronounced "You blew the engine!" and drove off.
When the smoke cleared, it was apparent that the brass fitting at the end of one new hose had separated from the flexible portion. Luckily, being a packrat, I had the old hose, plenty oil, and tools in the car, so was soon on my way again.
IF the oil squirting from the failed hose had been directed to the road instead of in a direction that made the leak obvious, I surely would've experienced a catastrophic engine failure shortly.