PyBSOD is a fake, open-source BSOD written in Python
from tkinter import *
bsod = Tk()
bsod.state("zoomed")
bsod.configure(bg="#0262AF")
bsod.wm_attributes("-toolwindow", 1)
bsodfrown = Label(bsod, text=":( Your PC is boiling mad!", bg="#0262AF", fg="white", font=("consolas", 40))
bsodfrown.pack(pady=20)
bsoddetails = Label(bsod, text="Oh, no! Your PC is boiling mad. This software is trying to calm it down by using a stack of big ice cubes. Please wait for this process to complete.", bg="#0262AF", fg="white", font=("classic console neue", 30), wraplength=800)
bsoddetails.pack(pady=20)
bsod.after(5000,bsod.destroy)
bsod.mainloop()