This is the first time I have seen spikes installed on top of fire hydrants in the city. Most fire hydrants have regular flat surfaces that make them a tempting place to sit down and rest one's feet after a long day of walking. But apparently, these two hydrants have other ideas.
Notice how the spikes were added and screwed onto the original structures and painted over? I wonder if the shop in the background has anything to do with this. Maybe the owners do not want people loitering outside the store.
Have you seen anything like this in your city?