"It never rains but it pours."

After the downpour of yesterday night in Madrid, I thought of this proverb. It means that misfortunes do not just happen a few at a time, but in large numbers all at once. For example:

Fred: I can't believe it. This morning I had a flat tire. When I went to the garage to get the tire patched, I discovered I didn't have any money, and I couldn't even charge it because my credit card's expired.Jane: It never rains but it pours.

This proverb implies a pessimistic view of things. Do you agree with it? Has it ever happened to you something similar? Or would you rather think in a more positive way? Do you know a positive proverb opposing the one for today? ;)