Thursday’s TV highlights: ‘Siren’ on Freeform

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Jay Leno’s Garage Fellow former late-night host Craig Ferguson shows Leno how to be a rebel while driving a British mail delivery car in this new episode. 7 and 10 p.m. CNBC

Supernatural Either Sam or Dean (Jared Padalecki, Jensen Ackles) could find his life drastically altered by an impulsive…