Holding eye contact works best for 7 to 10 seconds in a one-on-one conversation, and for 3 to 5 seconds in a group setting, says Ben Decker, chief executive officer of Decker Communications, a San Francisco-based training and consulting firm.
And then comes a green double-decker bus which lists its destination as "nowhere" - just like the one on the sleeve for The Sex Pistols' Pretty Vacant.