If you've ever watched the Dalai Lama speak, you notice how happy he always is. This runs contrary to his life experience or the plight of his people.
Now, read this article on laughing rats. Laughing can be an indication of joy, a suggestion of being a non-threat, or it can be used as a tool of subversion to keep elements of society in check.
Here's my theory - the Dalai Lama is always amused because he's in on a joke that the rest of us are missing. Wanna guess the punchline?
And because this was so well played: