ok, heres the deal. A small group of people with similar reality defying abilities as Frank West of Dead Rising. Your trapped in a shopping mall infested with zombies and must save innocents, fight psychopaths and use all manner of crazy, stupid and downright silly methods of killing hordes of zombies.
Go to an ordinary blender and make a drink that will make you insanely strong and untouchable by zombies so you can barrel a whole hallway of them down with survivors in tow. Pick up a guitar, whack a crazy cultist onto the ground, then play a rocking solo and break the guitar on the cultist Rock Star style. Pour cooking oil down an escalator and watch the 30 zombies slip and tumble down, then go ahead and grab one and use him as a boogie board to ride down it. Or just break their faces into tv's, kick them, knee them them, stomp their heads in and wrestle them WWE Smackdown style.
There is a helicopter coming in four days. You'll have to face various tasks to insure you survive that long, such as repairs, provisions gathering, weapons gathering, saving important survivors, killing weird and crazy people who have gone insane and defending barricades.
This will be freeform for a small group, 2, 3 or maybe 4 people, though it would be easier with one if theres little interest. I'll play as GM and will present events in a very video game like way. The areas and important details will be described to you, and the outcomes of your decisons will be at my mercy, though I'll try and make things both unpredictable and interesting as well as fair.