I just found one in my hallway at the entrance and killed it. I didn't know what it was. I thought it was one of the fuzzy balls my seven year old had brought home from school. I was going to save it for her but then it felt weird when I touched it because it didn't feel a toy. I squeezed it, the shape changed. I squeezed again not knowing what I am touching yellow stuff started coming out of it, that is how I knew it was a bug. I came and looked on line what it could be and that is how I know what I just killed. If there is another one in the house would it harm anything or I shouldn't worry.