<a href="http://uproxx.files.wordpress.com/2012/04/sick-mac-220x289.png"></a>You might have <a href="http://www.huffingtonpost.com/2012/04/05/mac-flashback-trojan_n_1405766.html">heard about Flashback</a>, and it's a serious issue (find out of you have it <a href="http://mashable.com/2012/04/05/mac-flashback-trojan-check/">here</a>).