If they could kill two birds with one stone, then why not three?

We kill several birds with one stone here, my friend.

Well, now we can kill two birds with one stone.

That way he could kill two birds with one stone.

He was trying to kill two birds with one stone.

"I only know if things had gone his way, he would have killed two birds with one stone."

"They are trying to kill two birds with one stone."

Seems like we can kill two birds with one stone.

This way you can kill two birds with one stone.

He would kill two birds with one stone and also see what the girl was up to.