In the Museum, one of the statues that is covered is obviously flipping the bird. Also, I hit a car once and a woman screamed "I can't WAIT to go back to San Andreas!"
Also I want to find the stroller. I'm sure the reason Rockstar never put children in GTA is because the fascist political fucks would burst a vein if we could run down screaming babys or 12 year olds. Look at how much shit they got for Bully, a game with no blood where no one even died.