What can we learn of personality from a signature? Very much I think.
I'd say the second example shows the signee to be untrustworthy; the theatrical combines with angst ridden egomania to create a perilously unbalanced mind. There are definite signs of a depression which could end in self destruction.
But I'm no expert. And graphology after all is a disputed science.
So here's an interesting puzzle. Who signed these autographs?
The identities, if not immediately obvious, can be found in microscopic type at the bottom of this posting.
Top: Nelson Mandela
Below: Adolf Hitler.