Network Spoofer lets you mess with websites on other people's computers - flip pictures, change Google searches, redirect websites, swap YouTube videos and many more features to come.
DISCLAIMER: The developer(s) of this application are not in any way responsible for it's use or misuse; only use it for demonstration purposes on networks for which you have permission to do so.
* Root (superuser)
* 500MB SD card space
* Motorola Atrix (and any non-armel based CPU handsets)
* Droid X (solution being worked on)