In its idealized form, your laptop is untethered, free to embrace its potential as a mobile computer, going from lap to desk to table at will. In reality, we've got to pause and plug these suckers in sometimes, which is where one of my top computer pet peeves comes from.
We've all figured generally where the space bar should be on a laptop keyboard (and most of the other keys as well). The same goes for where the touchpad should be and other basics. But every time I go to plug a new laptop in, I have to play hide-and-seek to find the power port.