如何使用__callStatic [无错误]在类中调用非静态方法

I have a class with one non-static method function Tire(){} like this

class Car{
  function Tire(){}  
   static function __callStatic($func, $arg){
      if(method_exists(__CLASS__, $func)){
          return self::$func(); 
       }
   }
}

I am trying to call it statically as

Car::Tire()

But, I get this error.

Strict Standards: Non-static method Car::Tire() should not be called statically 

Writing return self::$func(); actually runs the $func statically and returns it result. You can't run a non-static function statically — thus, the error message.

You can not call a non-static function from a static context. Static context doesn't have any object to operate with. If you would even be able to call that non-static function, how would it operate if the object does not exist?