The two-handed shake theory

Do you think devious/insincere people shake hands or greet others often with both hands?

This two handed shake goes for many politicians when they congratulate rivals, people that fawn over superiors, and most anyone that harbors crafty intentions for the hand they hold. This action usually comes with a slight bow and a fully toothed smile - another pointer toward insincerity.

Watch how Tom takes Jerry's outstretched paw, even as he plans to trap him yet again. It's always two-pawed.