I last wrote about mixed metaphors in in the November 2008 issue of Word Ways. A friend who read that article chastised me because not all the examples I cited meet the strict definition of a mixed metaphor. After some consideration, I conceded that she had a point.
""Let's Push the Envelope Out of the Box": More Mixed and Mashed Metaphors,"
Word Ways: Vol. 44
, Article 15.
Available at: http://digitalcommons.butler.edu/wordways/vol44/iss2/15