Does your sister have young children?

I know when I was around 7-11 yrs old, me and my friends would do things like fill the mufflers of our parents cars - then sit back and watch the water shoot out when they started their vehicles - we thought it was really cool! When my best friends mom would come home, we'd take the hose and douse the front rotors. Again we thought it fun to hear the sizzle of the rotor as it cooled off.