Once a Blabbermouth, always a Blabbermouth...
Anybody notice Ralph actually commited the same offense as Alice's mother? When Norton came down ready to go to "Murder Strikes Out", why did Ralph give the ending of the play away? He could have easily said: "My mother-in-law the Blabbermouth just gave away the ending of the play. But I won't spoil it for you Norton. Take these two tickets so you and Trixie can go; make sure you don't run into the Blabbermouth on your way there."