I have to say I had the exact same reaction as the narrator of this clip, when I first saw this interview with Christine Lagarde a few weeks ago.
Just watch a few seconds from 0:23min and you'll see what I mean...
Christine Lagarde is a smart woman. She knows about body language, but even she is not immune to her own subconscious.
The moment she was about to cross her arms, she remembered, but it was too late. You didn't have to be a body language expert to spot it :)
I didn't know all the other small hints and clues, though, so I highly recommend watching this clip!
Especially as a crypto fan, you'll enjoy it!