(Tempe, AZ)  --  Actor Jean-Claude Van Damme's youngest son is facing charges in Tempe, Arizona.  TMZ is reporting that 21-year-old Nicholas Van Varenberg was arrested Sunday in Arizona for holding his roommate at knife point.  Police say Van Damme's kid punched the elevator in his building and hurt his hand pretty bad.  When cops arrived at his door his roommate answered and that sent Van Varenberg into a rampage.  The roommate claims Van Varenberg grabbed a knife, but he was able to escape.  He's now is facing assault and drug charges.