<img src="http://imgs.xkcd.com/comics/the_sun.png" title="Obligatory bad guy: This operation is sheer foolishness, and it's not happening on my watch! Mainly because I can't figure out how to adjust the time." alt="The Sun" /><br/>

Xkcd readers refer to the title attribute as the "alt text". The OP just wants to be able to read this.