Of course all your email accounts, social networks, cloud services and payment details are up for grabs if someone grabs your laptop while it's logged in -- because, really, we're all to lazy to log-in over and over. But at least your drivers are safe!
Today's XKCD was a real treat to wake up to, but best of all was the mouse over:
"Before you say anything, no, I know not to leave my computer sitting out logged in to all my accounts. I have it set up so after a few minutes of inactivity it automatically switches to my brother's."
It's serve him right for switching the language setting on your phone to Arabic all those years back, right? [XKCD]