First, a word of caution: there is a possibility that Blizz may consider this strategy to be griefing, so employ it at your own risk. It is, however, awesome. Apparently, if you're a Hunter, you can get a beggar killed, in town, if you're near an NPC that you can declare war on. For this example, we'll use a Cenarion Circle NPC (which I think there are in every major city). To summarize the OP:
- Beggar asks for gold.
- Invite beggar to group.
- Set "at war" with Cenarion Circle, put Misdirection on beggar, and shoot the Cenarion Circle NPC.
- The NPC will attack and probably kill the beggar.
[Thanks to Brisk of Eldre'thalas for sending this one in]