When shit hits the fan but "Shit hits the fan" isn't the good level of gravity for the given situation.
Comes from the etymologic roots: "Shit" and "Hurricane".
The project situation just went from shitstorm to shitricane.
When a baby's diaper is not able to handle the job and it gets everywhere.
Oh no! Little roger had an apoocalypse all the way up the back of his neck. Errk. Tag! Your turn!