You are using 'mind power' without realising it.
When you saw a black cat, then something strange happen, you associated the two as being connected. Now it has become your
expectation, so strangness
will happen when you see one.
We all have the power of manifestation to some extent -
ie - if you think of, and expect, bad events, they will happen to some degree.
The Power of Positive Thinking and Attitude