Its Raining Men, I mean Mudd

Mother Nature is doing some odd things lately. Yesterday I think it rained mud for a while during the day. On Thursday night it downpoured all night and when I got inot my car Friday morning it was clean from the rain. I drove to work, yada, yada,yada. When I left work at 4PM my car was covered in what looked like muddy rain drops. Similar to this picture.
Muddy Rain Drops would make for a great name for an emo band, but when falling from the sky its not as cool. I'm not even too sure how the science behind this would work.