But from either seat point of view don't you just hate it when the other pilot:
Puts his fingers on the MCP selections waiting, waiting, waiting, in eager anticipation of either an ATC instruction, or second guessing what you are going to ask him to do.
Ditto placing hand ever so casually on the flap or gear lever ready ready ready to instantly select same as the first syllable leaves your lips.
Ditto "hovering" over the controls when you are landing/taking off with fingers just touching the wheel and you can feel his feet on the rudder pedals.
Spouting unwanted "advice" on final approach with nervous words of encouragement.
Superfluous read-backs of ATC instructions. Long winded blah blah PA's that make you cringe with embarrassment.