The last super volcano was 75,000 years ago. Light was blocked out all over the world. 35 centimeters of ash fell *2500 miles* away. The global temperature plunged 21 degrees. Mankind was almost extinguished, cut back to only a few thousand. This one...could be *ten times bigger*.
I was there; it wasn't really that bad. It just kinda ballooned, fisherman's-tale-style, over the last 75 millennia.