From 8-year old Hilda’s diary:

I went out on a boat again today. I remembered that it was the thirteenth and I was afraid that maybe something awful would happen, but it didn’t except that I felt very seasick, but I didn’t throw up. Daddy asked the boatman where the best fish were and the boatman said he didn’t know, that all the people on our side of the lake went to the other side to fish and all the people on the other side came to our side to fish but everyone caught about the same amount of fish.