What is going on here?

[Just Dreaming]

I could get a random thought of a guy on a unicycle.. and later that day or the next, I'll see a guy riding down the sidewalk on a unicycle! Whatever I would randomly think about, would eventually manifest shortly after. It used to blow my mind but it started happening so often that it doesn't too much anymore. HOWEVER, when I try to do this purposely now, it doesn't work. Why is that and how am I doing this?

[Willy Phallicus]

By trying to consciously and purposefully do it you are putting an emphasis on an outcome which sabotages your manifestation.

[YIDIRYIDIR]

I guess it's selective attention, but that's only my guess. 

[niko123]

Synchronicity  Your intuition is in line.