EDIT: Lots of people seem to show up at this page wondering about this message. Here is the scoop, it usually is fine if you're playing around with code, but bad if its a production environment. You will be doing everything with root privileges. To make an analogy: its like returning a book to the library that belongs to your boss, do it if you have to, but you probably don't want to do it usually in case there are any issues!
Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as root will break this application for all non-root users on
Fuck you Bundler, I'll do whatever I want as root. It seems that I always seem to creep in some sort of configuration issue with my gems. I always need to "sudo gem install" and sudo this and that, (or Sudo !!, I love sudo bang bang)
Anywho, back to look at my stolen CPU graph in NewRelic and wonder why I don't run this stuff on a high powered machine . . .