There are two types of writers in this world: those who use too many commas and those who use too few. While unnecessary commas can turn straightforward sentences into twisting labyrinths of syntactical confusion, missing a critical comma can change the entire meaning of your sentence.
Consider the headline from the now-infamous Rachael Ray cover of Tails magazine: “Rachael Ray finds inspiration in cooking her family and her dog.” While the line breaks of the original cover make it apparent what the editors meant to say, the lack of commas between the three items in the list—“cooking,” “family,” and “her dog”—caused Tails to accidentally portray Ray as a cannibal who gleefully cooks her family and dog.