There's/that's... for you disapproving informal
This phrase is often used under the implication of irony.
Someone or something is a typical example of someone or something bad
You helped her a lot, but she betrayed you. That's gratitude for you!
A: "I can't believe he had an affair with his secretary." B: "There's men for you!"
If someone has a cast iron stomach, they have a strong stomach that can digest unusual food and even bad food without being ill.
Jimmy must have a cast-iron stomach, when he drank milk with lime juice and felt perfectly fine afterward.