When people are dead or dying, there will be a trickle of blood from the corner of their mouths. Nothing cures the blues like killing 30 or 40 people. Bad guys will make elaborate inventions to kill the good guys, but will leave before finding out if they work. Christmas Eve and Halloween night lasts for three or four days. Police never wait for back-up.
Undercover cops are too good to be spotted.
Private detective work is glamorous. All baseball games will be won with a home run in the bottom of the ninth and two outs. All police killings are in self-defense. Everyone wins in Las Vegas. Good guys don't take drugs.