Thats a Bad Bad Baby

Go to a local coffee shop with a baby carriage- inside the carriage have a baby doll that is tied to a brick. Cover the baby in blankets - get a cup of coffee and start talkin to the fake baby- Tell the baby what a good good baby it is and how much you love him. Then spill a little coffee on your leg and scream. Then out of anger scream "Thats a bad bad baby!"- and launch the baby tied to the brick through the window- People will freak out that you have just thrown your own baby through the window-
Turn to the guy next to you and say "I hate it when they make the coffee too hot." Casually walk out.

Chinese Nightmares

You hire a good friend of yours (boy or girl does not matter) to dress up with basically just a clown mask on
and only stilletos; hand them a gun.
You get a motel room and
order a huge order of chinese food for delivery.

When the delivery gets there
have them answer the door, pointing the gun
at the delivery man.
When the chinese guy freaks out, have them say, "Today is a good day to die."
Then instruct them to shoot at his knee.
You will have to run because the cops are coming,
but you will give this guy awesome nightmares forever