[Privateer]

Ante Scriptum: This is a social glitch, it may cause some lag on your comp but that can't be helped. It also works for any other staff skills, Take Aim, and Long Volley.
1) Ok then... take out your staff gun or nade.
2) Kill an enemy or two until you get a loot drop.
3) Charge the skill ALL THE WAY.->Skill as in Staff Spells, Take Aim, and Long Volley
4) Press Shift to open the drop.
5) Let go of the Left mouse button/Ctrl key
6) Close the drop.
Fin) Grats! You did it!

Post Scriptum: If you want to cast another spell for staff, you must charge your selected spell again, let it fizzle, then you can choose another spell.
Post Post Scriptum: The charging animation will still run if you choose annother skill.
Post Post Post Scriptum: The Olympic Torch Glitch was brought to you by the French! Kill the Spaniards!