This improv game is in the following improv game categories:
All players walk around the room. Start by one player pantomiming throwing a knife, ninja-style, to another player. That player catches the knife and throws it to another player. Players should have eye contact between thrower and catcher before the knife is thrown: it should be very clean who is supposed to catch the knife.
Once that goes well, add a pantomimed baby, which gets thrown very carefully. Give the baby a sound that is clearly distinguished from the knife.
Finally, add in an angry cat. Again with distinct sound.
Feel free to add other objects but make sure throwing style and sound are different.