Nothing to worry about. I'd be delighted to get stinkhorns in my garden, they are such strange/weird things. They are said to be common, but I haven't seen one in about 10 years. There are also some related fungi that are even weirder, though more common in tropical climates. They expand out of an round white "egg" that can be confused with a puffball. These "eggs" are sought after to be eaten as aphrodisiacs, though I'm not sure I'd want to eat one!