You've just been lucky. I work in a university, and I can't indulge myself into that luxury. There's always some "smartie" who tries everything to get at the admin password or restricted areas. You name it: software keyloggers, HW keyloggers, cellphone cameras (taking video while someone is writing their pw or entering an access code in a keypad), the ol' looking over the shoulder trick, etc. Of course, most of those hackers-wannabe's are either suspended from the university, or dropped off after applying disciplinary action. I use a biometric HW key for really critical things, and if I ever need to write a password @ a public use computer at the university, I change the pw immediately a few seconds afterwards. I've had my share on too many hacking attempts.