Consider the terminal velocity of a baseball. It has been mathematically proven to occur at 73.8mph. A knuckleball or curve ball released at 80mph may decelerate to 73.8mph over the plate. Are these "strange" effects sharply noticed at any other velocity?
Wind tunnel lab experiments confirm similar baseball terminal velocities between 92 and 94mph. A 4-seam, slider, cut or sinking fastball is released at 100mph and decelerates to 92 mph at the plate. A faster spinning 2-seam fastball doesn't decelerate or move as much. Are any of these "strange" effects comparable at other velocities?
The ball physically "hops" twice, at 73.8mph and 92-94mph in the air we breath. There is direct evidence from wind tunnel experiments available. There is indirect evidence available from MLB hitters and umpires. Consider it a decoupling in the air waves, similar to a sound barrier, around the baseball while passing through its terminal velocity.
http://en.wikipedia.org/wiki/Trajectory_of_a_projectile
http://www.100.nist.gov/curverelease.htm