It's very important to not leave out the word "each." For example, when the price of 4 tacos is $2 vs $2 each, or
When you tell people that you and your sister each have a child
Batman and the Joker are in the retirement home together, working on crafts projects. Batman looks at Joker's cross-stitch of the night sky and asks, "Why'd you leave out the Dog Star?" Joker answers...
"Why sew Sirius?"