Sophia has learned how to stage a stick up. First get the toy gun from Wesley's cowboy dress up clothes (it can often be found laying around on the floor). Next, take the gun and point it at your brothers and sisters and say "Pa!" (pow). They will fall on the ground. Then everyone laughs.
After everyone's eliminated, she points the gun at herself and pows herself and she falls down too. Then they all do it again, they think it's a pretty fun game. Of course anything is "fun" and "cute" if it involves Sophia, we all love it.