Aut cum scuto aut in scuto
It's the alien space ship arriving! I saw the movie!!
And to complete the caption: DA-dun-dun-dun-dun-dun-dun-dun...
Super-Charged Volcanic Ash Cloud Sparked By Lightning In Calbuco, ChileVolcanic lightning only occurs during a particularly violent eruption when huge quantities of positively charged ash debris is thrown into the air.