When using recklessness, you can get more than just 3 charges.
What is needed:
[Blood Surge]
Bloodsurge - Spell - World of Warcraft
Your Bloodthirst critical hits have a 33% chance of making your next Slam instant for 5 sec.
Two weapons equipped.
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Using this combo, you get 4 crits:
Bloodthirst, Slam, Whirlwind.
BOTH hits of the whirlwind crit, that is what makes it great.
You can also use this on a group of mobs, with a 1h. Whirlwind will crit for everyone you hit. (Cred mahany25)
FAQ;
Q: Well, doesn't whirlwind count as ONE move? Therefore it should both crit!
A: No, you are wrong. Try using recklessness when you only have 2 charges left. It will consume both charges, resulting in only 2 moves used.