1. When enemies keep dropping Heavy Ammo when you don't need it.
Edit: What number are we on ;_;
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This isn't just in destiny, but any online multiplayer game; When people on your team not only suggest that you use an exploit, but insist upon it where they wont even contribute to completing the task the normal way, and the many failed attempts at doing the exploit actually take longer than the way you're supposed to actually do it.