When I was younger, I wrote down on a scrap of paper a date and time in the near future and kept it posted to a bulletin board near my desk. The idea was that if I ever had the opportunity to travel through time, I'd go to wherever I was at the point in time indicated on the paper to confirm with my younger self that time travel is possible.
The predetermined time came and went, and future Timotarou never presented himself to me. I eventually ended up throwing away the scrap of paper some years down the line.
Today I realized that I no longer remember what I had written down on the paper. I wonder if that's why I didn't show up.