A bullet travels at speed higher than that of sound. A bow-shaped shock wave will form at the nose of the bullet (Figure 1). Similarly, an aircraft flying at supersonic speed will also produce a shock wave. It results a sonic boom which can be heard. 

A yacht or kayak traversing a lake also produces a bow-shaped shock wave (Figure 2), known as bow wave. The bow wave gets larger as the yacht moves faster.

By the same principle, a high-speed current approaching an object can also produce a shock wave. Here is an example observed in space.

Solar wind usually travels at a supersonic speed of several hundred kilometers per second.  Figure 3 shows solar wind impacting on a planet like the Earth producing a bow-shaped shock wave near the Earth. It is known as bow shock. 

The intense solar wind causes the Earth's magnetosphere to be deformed, resulting in a tail-like feature  (see figure 4).

Another example of shock wave involves charged particle moving faster than the speed of light in a medium such as water. The light emitted is known as Cerenkov Radiation which is a photonic shock wave. [see "Nature's Wonder - What is Cerenkov Radiation?"]