Because the pee is silent.
They'll tell you
You have to have gooooooaaaaaaaaallllllllllllllllssssssssss!!!!!
Me: I peed my pants.
Poop: Please don't push. It's already tight in here! Poop to Pee: May I go first? Meanwhile, Fart pushing everyone to the sides.. Fart: Excuse me! Excuse me! I need to go!