When i was doing my apprenticeship, a cycle up a 1 in 7 hill, lorries used to have to struggle up the hill so i got into the hang of hanging onto the back, one missed his gear and started rolling back onto me, really scary, then there where the security who would lower the barrier as you approached to try and stop you riding into work, once in you had diesel shunters trundling round pulling wagons of steel scrap and very hot ingots, fly shunted wagons, with a man running at the side pinning down brakes, slippy rail lines,and lorry drivers opening cab doors, got knocked off once, by one nearly took my head and shoulders off due to the height of the cab door, and one of my mates got lassoed by a driver, roping and sheeting a load threw the rope over load and caught mates handlebars and he was off.
But somehow i survived 6 years of it.