Special liquid weapon

At first I thought it was a defect, but it turns out to be a special tool to get whatever I want. I noticed for a long time already, when I tried to call for assistant (using the top of my voice) or when I was angry with their service, some liquid will seep from this viewing device of mine (named: eyes). Everytime it happens, people come running and I get what I want immediately. This is a good tool and I shall use it more often.