The most anomalous experience I can recall was when I was 14 or maybe 15. My workplace was a makeshift walk-down below ground level, in which the restroom was constructed from plywood with a bare electric light bulb hanging over it IIRC. At the time of this incident, I was being frequently harassed by a co-worker about the same age as myself. While using the restroom on one occasion, it seemed for an instant that I was spraying blood into the toilet, yet in the next instant there was no sign of blood anywhere and the water in the bowl seemed perfectly clear. I initially assumed that this was some sort of prank on the part of my co-worker, yet I couldn't explain why there was no residue of blood to be seen, nor where there was any opening through which he could have sprayed it.

Later I wondered if it might have been a laser pointer, but the lack of any apparent aperture makes this just as unsatisfying an explanation. I'm also not sure these had been invented at the time (probably 1976.)

One plausible explanation eventually occurred to me: vg znl unir orra n genafvrag vyyhfvba pnhfrq ol n pbfzvp enl uvggvat zl bcgvp areir.