using System;

public class Program

{

    public static void Main()

    {

        var owner = new EventOwner();

        var user = new EvilEventUser(owner);

        owner.DoSomething();

    }

    class EventOwner

    {

        public event EventHandler SomethingHappened;

        public void DoSomething()

        {

            SomethingHappened.Invoke(this, EventArgs.Empty);

        }

    }

    class EvilEventUser

    {

        public EvilEventUser(EventOwner owner)

        {

            owner.SomethingHappened += EvilOne;         

            owner.SomethingHappened += EvilTwo;         

            owner.SomethingHappened += WillBeNeverCalled;

​

        }

        public void EvilOne(object sender, EventArgs args)

        {

            throw new Exception();

        }

        public void EvilTwo(object sender, EventArgs args)

        {

            System.Threading.Thread.Sleep(int.MaxValue);

        }

        public void WillBeNeverCalled(object sender, EventArgs args)

        {

            System.Threading.Thread.Sleep(int.MaxValue);

        }

    }

}