You really, really think I'd believe that?

You really think I'd believe that Bob tried to steal your food?

You just ate it. I watched you eat it. Bob didn't steal your food! He asked politely for some and you refused, so he left you alone! But you were so angry you tried to pin it on him!

I'm just massively ashamed of you right now. You've been acting weird lately. Can I help you? Do you need something?