"Changes the font to look like cat scratchings" is getting 1% of the answers as of the time I posted this comment. A small but bold cadre of users who are willing to sacrifice QOTD points for humor.
If the question had been about Page -> Encoding -> Autoselect in IE8 I would have gone for the fourth option as being very accurate at least some of the time.
I was tempted with this question, but decided to get it right instead - and now with maybe 21 people having picked the 4th option so far (it's still running at 1%) I feel as if those 21 have shown me up.;-)