A long time ago, perhaps about age 12 I had an "english racer" with steel rims that didn't break all that well when wet. I was on a morning ride on a farm road, the sort that is wheel tracks with grass. The grass was wet, the road ended at a 3 strand barbed wire fence. The crash involved an over the bar entaglement in which the bike, I and the fence became twisted together.

There was no one else there and it took a long time to get myself out by rolling the fence back to the upright and getting untangled from the barbed wire.

To this day, the sight of barbed wire renders me watertight.