trip to the basement

An exceedingly traumatic experience or series of events that ruins your otherwise fine mood; a total downer.

Person A: "How it is going?"
Person B: "Well, driving back from the doctor's where I was diagnosed with an inoperable brain tumor, I was in an accident that killed my wife, child and dog. Other than that it's all good!"
Person A: "That's a total trip to the basement . . . "