Your finger can make ripples or waves. Maybe this is why you get the funny effects of near c speeds. Congrats if you came up with this because it was a surprise to most physicists.
Nothing can move faster than the speed of light in a vacuum.
However, in materials you can accelerate charged particles that move faster than the speed of light in the material. This produces a blue-purple optical shockwave called Cerenkov radiation. It is indeed the visual version of a shockwave. It's why nuke reactor water has that nice blue glow. One of the main motivations for relativity was the ether debate.