A worker was pressure washing concrete slab. The hose became kinked. During the process of un-kinking the hose the spray wand slipped and made contact with the worker's hand just enough to actuate the water spray. The nozzle which was very close to the worker's right leg sprayed high-pressure water into the worker's calf. The action caused a pin-prick sized hole that was quickly filled with water and air. The laborer was admitted to the local hospital.