Lindsay Lohan has really pushed her luck this time: the troubled actress was handcuffed and sent into custody on Wednesday after a Los Angeles judge revoked her probation sentence, citing failure to perform mandatory community service. "Probation is a gift, not a right," the irked judge told LiLo and her lawyer before ordering that the actress be held on $100,000 bail. Lohan, who was serving probation for a 2007 drunken-driving incident and a misdemeanor jewelry-theft case earlier this year, may end up in the slammer again when she returns to court for another hearing on Nov. 2. The judge said she must perform 120 hours of community service at the L.A. County Morgue once she's released on bail.