Imagine, if you will, a paperback novel typeset as follows:

• The entire cover of the book (title, spine and blurb), the chapter headings, and the book title at the top of each page are all in Dom Casual.
• The occasional lengthy footnotes, as well as the page numbers at the bottom, are in ITC Galliard Italic, with too little leading.
• The main body text is in the supremely ugly LTC Twentieth Century.
• There is no hyphenation at all, so that it's fairly common to find a line with so little text on it that the spaces are half an inch wide, and extremely common to find a line in which noticeable space has had to be inserted between letters to make the text justify even remotely sensibly.

I'm really having a hard time imagining how it might be possible to make a book uglier than this. I'm not even convinced the use of Comic Sans would make it much worse. I'm also having a hard time believing that whoever typeset it managed to make it this disgusting by accident; I don't think you can do this bad a job out of simple ignorance. You would surely have had to have read a book on typography and deliberately disobeyed most of it.

(On the plus side, in the course of writing this post I discovered www.identifont.com, which is very cool and without which I would certainly not have been able to provide the exact font names given above.)