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He's back to his warlock ways!

Charlie Sheen is currently in a bitter war of words - and custody! - with his ex Brooke Mueller, and his latest public display of displeasure comes in the form of a birthday cake!

The Anger Management actor posted a slice of cake with a grenade on top to his Twitter account with the caption, "Happy Bday Brooke. When you're done s**king off the parking lot at Home Depot, why don't ya 'blow' out this candle?"

Funny part is, it's not even Brooke's birthday!

The Hollywood bad boy has been furious with his real estate agent ex in recent weeks, as well as Child Protective Services, because he believes his children Bob and Max's physical and mental well being is in jeopardy in their mother's care.

We have a feeling this is just the beginning!