BS Detector?

The other day we were leaving my parents' house and Twin B asked my dad where his dad was. My dad told him that his dad was dead. Then he asked him where his mom was, so my dad told him where she lived. The conversation progressed as follows:

Twin B: What's your mom's name?
Dad: Her name is Ruby. She's very sick.
Twin B: What's wrong with her?
Dad: Well, she's just very sick. She can't get around very well, she's going blind and she talks like this (mumbles incoherently)
Twin B: Okay, mommy, we can go now. Bye, G-Dad.
.
.
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As we're driving away:

Twin B: G-Dad was just kidding. I bet his mom's name isn't Ruby and his dad probably isn't even dead.

I'm glad we weren't out of the neighborhood yet, because I laughed so hard I was in tears!

So, what's the funniest thing your kid has said lately?