Eta Carinae may explode at any minute. Previous eruptions have generated huge gas cloud.

http://www.space.com/imageoftheday/image_of_day_070621.html

At any minute. I suppose that's a cosmological 'any minute in the next 100,000 years'

Belelgeuse might beat it to the bang:

http://www.earthsky.org/radioshows/48792/betelgeuse

That would be a whopper too. It's a red giant with only 10% the mass of Eta Carinae, but it's also only 6% of the distance.