The best mashups take something, put it into a different context, and actually improve upon the original. The folks over at the New Condoms tumblr are doing it right:
My personal suggestions?
- BMW: The Ultimate Driving Machine
- Maxwell House: Good to the last drop
- American Express: Don’t leave home without it
- Forbes: Capitalist tool.
- JC Penny’s: It’s all inside
- Nokia: Connecting people