...the omega vault opens, your watch commander goes in to retrieve whatever it has to offer, and moments later comes running out full speed, screaming in terror and waving his arms around over his head.
...you get news in the morning saying that every ork in leaving the sector at full speed, then in the afternoon find out they're leaving to avoid a new hive fleet coming in.
...an inquisitor receives a mysterious package from the omega vault, takes it into his quarters and a few minutes later blows his head off with a bolt pistol.
...a servitor monitoring the long range augury suddenly screams, runs to the nearest airlock and throws himself out of it.