I have always had trouble with my shower's water pressure, however recently I found out that if I concentrate on high pressure water, it gradually builds up pressure until I stop concentrating on it, then the pressure levels out for the remainder of the shower. This has happened over thirty times and I figured that my water heater started pumping after it had lost a certain amount of pressure, and this must have happened around the same time every day, however I did multiple tests with not concentrating on pressure and staying in the shower for the same amount of time each day and the pressure never increased when I didn't concentrate, but it did increase every single time when I did concentrate. What would this demonstrate? Pk? Extreme luck?
It could be either or. You would have to be extremely precise with all your measurements.