When it rains, it pours（ことわざ）

意味:
A lot of things tend to happen at the same time.
Those could be good or bad things.

泣きっ面に蜂（不運や悪いことが重なること）

⚠良いことが続いた時に使われることもある

会話文: 

シチュエーション 1　（不運が重なった時）
Ela: You look down, what is it?
Janel: Today I left my umbrella at home, same with my wallet so I was told off by my boss for being late. In the afternoon he took offense at my question.
Ela: Something bad happened to you all day. When it rains, it pours.

シチュエーション 2　（幸運が重なった時）
Joe: How is your job search going?
Jim: Actually I had been applying to jobs for months and I hadn’t heard back from any of the employers, but then last week I got three interview offers.
Joe: Wow, congratulations! I guess when it rains, it pours.