Choose one person to be the plumber. The plumber has to run around and tag people. If you get tagged you have to get down on one knee, stick your index finger out and you are frozen. To get unfrozen, a person who isn’t frozen has to sit on your knee like they are “doing their business” then they have to push down your index finger, while you make flushing noises. Then they have to wash their hands by rubbing their hands together with yours. Then the “toilet” is unfrozen. If a person is “on the toilet” they cannot be tagged.