Help with splashscreen- keeps popping up after load.

Every time the game goes to the menu, the splash screen plays. I know there's a way with persistent statements (I did it before but I've completely forgotten how)

I need this screen to pop up just once when you open the game, then skip until you close the program, then repeat- like a warning screen.

Here's what Ive got:

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label before_main_menu:

    scene black with Pause(1)
    show t_warning with dissolve
    show text "spookies ahead" at truecenter with dissolve
    with Pause(7)


    hide text with dissolve
    hide t_warning with dissolve
    with Pause(1)
    #test code go burrr



    call screen twconfirm() with dissolve 


    return

Any help is greatly appreciated!