Continuing on my latest nerve block binge, I'll be talking about the amazing supraclavicular brachial plexus nerve block.  This block, if performed correctly, gives anesthesia to the arm from the level of the lower part of the deltoid to the fingertips.  Think about using this block for complex lacerations, fractures, abscesses, or any other painful condition.  
As with any block, there are always bad things that can happen.  Don't lose sight of that needle tip, don't inject into a blood vessel, and don't cause LAST (local systemic anesthetic toxicity).