Charlie to Brooke: Don't Fight a Warlock ... You'll Lose

4/15/2011 9:30 PM PDT
Charlie Sheen fired a warning at his ex, Brooke Mueller, when he heard about her trip to a pawn shop and possible drug relapse -- "Don't pick a fight with a warlock ... 'cause you're gonna lose."

Charlie got wind of Brooke's strange pawn shop visit ... last night in Toronto -- and told Canadian entertainment show, etalk ... there are consequences if Brooke falls off the wagon.

As we reported, Brooke has to get a new drug test by 6PM tonight.

Clock is ticking ...