One of the best things to do in this game is to have a gun fight with the police in the middle of a busy highway, the cars just never stop coming and they are always speeding. The chaos it causes is pretty fun.
The paramedic pulling up to scene, only to hop out of his truck and be engulfed in flames was the high point in mindless carnage for me. Close second was the guy that got hit trying to run away from the explosions.
Um, that's a little poor in taste. That's a pic from one of the worst civilian massacres in the Gulf war when US forces strafed retreating Iraqi forces on a highway that was also packed with fleeing civilians.