The twins are normally pretty good about sharing toys, but occasionally we run into issues. They know that sharing is the right thing, but they still occasionally try to find a way around it. Here's a rather classic example from this weekend:
Declan is sitting with an action figure laying on his lap that he is clearly done using.
Cormac: "Mom, Declan won't let me use his guy and he is done with it."
Me: "Declan, can Cormac use that guy?"
Declan: "No, I am playing with him. In this episode, he is sleeping."