From the saying, "You can't get blood from a turnip." If you sue a "turnip," you will probably win, and get a judgment, but you will have no way to collect on it.
"I just want you to know that, when we talk about war, we're really talking about peace."
"I hope you leave here and walk out and say, 'What did he say?'"
When one turpin is insulting another turnip, he will call him a bush. It's all horticulture really when you think about it...