Ever since I was little, I noted that bad luck comes in threes. After the third bad incident of the day I'm usually home free at least till tomorrow. Couple of days ago, I had a more difficult than expected operation, problems with my online purchase and problems with google adsense for this site.
Fortunately, all 3 issues are resolved as of today.
This is in no way scientific, probably the human trait of trying to look for patterns where there is none, and me forgetting all the days when I had non-3 bad things happen to me.