What the hell hit my car?

I live in South West Florida and I was driving down a road at night with trees on my right, all of a sudden I heard a huge BANG and saw that there was a large splatter of gooey something stuck on the right side of my car.. I did not see what hit me or anything weird before it hit for that matter. The liquid smells very foul and kind of like red tide, very ocean-like. There were pieces of what looked like egg shell maybe.. I don't think some one threw an egg at me because why would it smell so bad? It does not smell like a rotten egg I might add. Also the splatter is on the side of my car so I don't see how an egg could have fell and splattered like that on my car.. Any ideas?