That hi PSI can do some crazy shiit. We used to put ball bearings in the nozzle at the bike shop. Those bbs do not lose speed for a good 20'.
BB-ever 'float' a ball bearing above the nozzle in the airflow?
caution-this is likely not OSHA approved/although one of the safest high pressure air hose forms of horseplay-so don't try this at home.