Brazilian graphic artist Mario Amaya created a series of visual puns on corporate trademarks, tweaking text and logo elements of two separate brands to arrive at a compelling hybrid. Some of the logo mashups work so well that you have to look twice to realize what's been changed.
Although these graphic novelties were originally made for fun on his personal blog, they've made the rounds of cyberspace a few times over and do a great job of illustrating the power of corporate branding and psychological association. Even when the text accompanying a logo is completely contrary, the image still triggers familiarity in the mind.
Amaya recently added another batch to the series, and all links to all three pages are available below. His commentary on the whole project is worth reading as well.
Part 1 (April 2008) / Part 2 (May 2008) / Part 3 (December 2008)