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The joint will rip in half under this type of failure (not very common), typically one of the brearing pins has snapped off (or worn off in the case of a dry joint which is also a lot of the failures).
In the picture posted you can clearly see the snapped off pin that the bearing cup rides on.
Replace your driveshaft U-joints regularly, they're pretty cheap. Your half shafts see about 1/2 the force the driveshaft does so replace all of the joints every other time.
While you have the driveshaft off check your free-play on the pinion...
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