This concept is pretty amusing if you ask me.
This is an ongoing project by Graham Smith showing what would happen if popular companies and competitors swapped logos. Very nice! Visit his site for many more.
McDonalds and Burger King
YouTube and Vimeo
Ferrari and Ford
FedEx and UPS
Google and Yahoo!
Nikon and Canon
Audi and BMW
Visa and Mastercard
Netflix and Hulu
Reddit and Digg
Pizza Hut and Dominos
Skype and Google Talk
Best Buy and Walmart
iPhone and Android
Nike and Puma
Facebook and Twitter