Can't get coward ending in 2 state

[yykk0532]

No matter how much I clatter the door, it won't close. What should I do?

[Leo The Evil]

You mean getting the bucket inside Stanley's Office? You need to randomly begin a game where the telephone is ringing. Answer the phone, then immediately go for the bucket and back to room 427 while the recorded voice is still talking. The door will remain open while this happens.