[/LIST]Sorry to nit pick, but the thread was for B737 gripes/misunderstandings. Many answers are relevant to any type. So, to prove I'm like minded and fickle I'll add mine. [/LIST]Asking ATC if there is any speed restriction below FL100, keeping the speed at >280 then pulling speed brakes at 3000'. You might save 15secs if you're lucky.[/LIST]Flying visual circuit arrivals in level flight, or even worse in VNAV/LNAV and autopilot. This has been touched on many times in other threads, so I apologise. [/LIST]Fuel cross feeding/balancing well before the IMBL caution is alive. First 1 way then the other. No time to monitor if there is a leak.[/LIST]Pumping the elevators on rotation and flare.checking loadsheets with Japanese brains. No idea of gross error checks nor mental arithmetic; even the university wallers.