Interesting fact:

Researchers have found that how we position our thumbs can be an indicator of our personalities. For instance, high-status individuals were found to stick their thumbs out of their pockets as a high-confidence display. Generally, when people carry their thumbs high, it is a sign that they think highly of themselves. On the other hand, nervousness and embarrassment can be evident if a person fidgets with their hands or plays with the rings on their fingers.