Could You Get Hit By Falling Space Junk?

Three mysterious "space balls" recently crashed into Vietnam. What are the chances of getting hit by space junk?

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Unidentified space balls that landed in Vietnam investigated (CBC)
"Three mysterious metal spheres that fell from the sky and landed in northern Vietnam on Saturday have been seized by the Vietnamese military and are being investigated, Vietnamese media report."

Dealing with Space Junk: The Rocky Road Ahead (
"Following 50 years of space exploration and utilization, more than 22,000 pieces of space junk at least 4 inches (10 centimeters) wide are now being tracked in Earth's orbit."