The violent Bronx nut accused of fatally randomly stabbing a 14-year-old boy as he walked to school was booted from court Sunday when he launched into a “crazy’’ rant about the “White House” and “al Qaeda.’’

Waldo Mejia, 29, had been hauled before a judge for allegedly killing tragic teen Caleb Rios by sticking a knife into the boy’s chest on East 138th Street on Friday morning. The suspect also was being arraigned on an unrelated stabbing Mejia allegedly committed about a week ago.

Authorities have charged Mejia, who lives down the block from the teen’s family — and right across from the 40th Precinct — with second-degree murder, attempted murder and other offenses for the heinous crimes.

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