Watercress - Cruelty lyrics

How can I be so cruel when I don't know what that means? I know it's cruel to k** another person, Or to torture fluffy animals for fun. The problem that I find is where to draw the line And not be cruel to number one. Is it cruel to wash a spider down the plughole, Or to eat a lamb with mint sauce for my tea? Is it cruel for me to say that I'll never fall in love with you? What about cruelty to me? I know it's cruel to go out hunting foxes, Or to put my aftershave in rabbits' eyes. But what I want to know is how far do I go, Does this rule extend to embryos and flies? Is it cruel to k** the microbes in my toilet? Or to swat a thingy like a stingy bee? Is it cruel for me to say that I'll never fall in love with you? And what about cruelty to me? Oh my, what about cruelty to me?