Captains that spend 95% of their time all flight complaining about how bad the company is, how bad pay is, and whether or not they will make their outbound commuting flight. If your life is that miserable, for god sakes grow a pair, resign, and find a new career that will allow you to earn what you think you are really worth.
I am also annoyed by peolple who slow down 2 miles before their turn, then slow to a full stop, then make a turn off the road without their turning signal.