I climbed Mt. Etna once (in Sicily). It wasn't erupting at the time but there were active lava flows etc. The scary thing was that even though conditions were r

I climbed Mt. Etna once (in Sicily). It wasn't erupting at the time but there were active lava flows etc. The scary thing was that even though conditions were relatively benign, a sudden change of wind direction blew a stream of sulphorous-smelling air in the direction of our group and we all had to run back down to the chair lift gasping for air.