Stupidly easy...

[iago]

A program is stuck open on my computer.  Everytime I try to exit, it says "rkvg".  What's wrong?

[Sidoh]

It wants you to type "exit" in rot13! :)

[iago]

Well, it doesn't want me to, but I was :)

iago@slayer:~$ rot13
Lrf, gurl nfxrq guvf dhrfgvba gb frevny xvyyref ng n cevfba.  Nyy bs gurz tbg gur dhrfgvba evtug nyzbfg vzzrqvngryl.
Yes, they asked this question to ------------------..........
exit
rkvg
exit
rkvg
EXIT
RKVG

:-)

[Ergot]

Lies! The correct answer is that you're not trying to end the program more efficiently... ctrl - c ... kill ... kill -9