Evil Apps - "I solemnly swear I am up to no good."

So, I was wondering if anyone here had a favorite app that may be considered...mischievous? Android's openness allows for a lot of possibilities and powerful apps.  

Some of the few I know of and have played with are DroidSheepWifiKill, & Faceniff. I've been pretty impressed by the ease of use and sheer might of these applications, but as I said, they're all pretty similar really. 

What are some other "evil" apps you have tried?