Oh please.
Just download a simple keylogger and act all dumb and go 'sir, would you be able to login while I check this one site, it's important' he comes over, types in his credentials, supervises you, then makes sure you log out.
Too bad it's all logged to notepad.
Gee that was hard.
My school's security was shit, they had a remote control package set up, so I hit google and downloaded the 'teacher' client, installed it, and could instantly take over any PC I wanted to, including the domain controllers. (All logged in) .. so i'd wait til' the techs duck out then quickly fire up dsa.msc; find some random teacher who left's account and assign it to Administrators. From there I manipulated accounts and set up ones such as GHOST, trick them into thinking they were default accounts craeted by their programs. School is such a breeze when you have access to everyone's home folders, including the teachers.