Just found a great new phrase on girtby.net:
Ransom note typography is rampant amongst the technical documents that I see on most days.
He links to this definition:
ransom note typography
Using too many fonts in a document. The term comes from the text in a ransom note that is pasted together from words cut out of different magazines and newspapers.
The ease with which fonts can be selected in a word processor has led many inexperienced people to use too many fonts in a document or newsletter. Typographers and graphics artists know that only two or three fonts are necessary for the most professional appearance.
It's a great turn of phrase; I'll be sure to use it soon. Make sure your fonts are selected with care if you're asking me to review your document!