This is a few years old, but if you've never heard these things, it's definitely worth taking a look at.

This guy create a jet engine and is using it to super cool his can of Guinness. Check it out on Asciimation

Often times there will be troublesome characters in your HTML. This is especially true if you've copied text out of word processors, such as Micorsoft Word. The problem is that these trouble characters are not ASCII, and therefore don't display correctly in the browser. These special characters need to instead be escaped, rather than placed directly into HTML.