It sounds like you're describing the sound made by a trombone or trumpet, often with a mute (sometimes called a "wah wah mute"), where the first note is followed by a note that is one tone lower. It is found in bad comedies to indicate irony or disappointment.
This is what I was going to say. Imagine that, joefromchicago and I thinking the same. What's next?
Fire and brimstone coming down from the skies! Rivers and seas boiling!
Forty years of darkness! Earthquakes, volcanoes...
The dead rising from the grave!
Human sacrifice, dogs and cats living together... mass hysteria!