Update: A Blenheim family say they are also victims of an aircraft toilet holding tank accident after their car and driveway were hit from above by a smelly brown mess.
Karen Hartshorne and her teenage daughter Lydia had just pulled up their driveway last night when they were hit by what appeared to be a freak hail storm.
A series of large splatters pelted their car.
Their car and much of their driveway were be coated with a foul-smelling brown substance.
"It didn't even make a noise. It just kind of went plop and smelt disgusting," Ms Hartshorne said.
There has been a spate of similar reports nationwide in the last week, since a farmhouse in Wellington was splattered with a brown-green substance moments after a jet flew overhead.
A spokeswoman for the Marlborough Aircraft Control Tower said there did not appear to be any commercial aircraft flying in the area at the time of the latest incident but said there could have been "anything" flying around at that time of night.
The Hartshorne family has taken a sample of the substance but will await a finding by the Civil Aviation Authority on the Wellington case before submitting the sample for analysis.
Test results on the Wellington case could be back tomorrow, a Civil Aviation Authority spokesman said today.