I don't know how many times I've heard Bohemian Rhapsody, but it was only when I was driving home from Exeter with my Dad the other day, and turned on the radio to keep myself awake, that I realised that that line has a comma in it.
It doesn't mean that Mama just killed a man, it's the guy telling his Mama he just killed a man. I always wondered why if his Mama had killed the man, his life would be over. Now it makes so much more sense.
What a difference a little comma makes.