Corvus doesn't have a recent version of this meme up, I caught it off Facebook - but the rules are set as thus:
You are in a mall when the zombies attack. You have:
1. one weapon.
2. one song blasting on the speakers.
3. one famous person to fight alongside you
Weapon (First Choice): Bayoneted Shotgun
At one point they were against the Geneva Convention, but they exist nonetheless. I simply can't resist the possibility of bringing a shotgun to a zombie fight, but also realize that ammo will be finite. Hence, the pointy thing at the end.
That said, I acknowledge that this might constitute two weapons instead of one, so:
Weapon (Second Choice): Shamshir
A shamshir is a type of sword, similar to a scimitar but not as heavy. It's light, so it won't wear you out as you swing, it's biased towards slashing and not stabbing - which is how you should confront a zombie anyway, and it's one handed so you'll have a free hand to grab impromptu weapons, open doors, press buttons or hold that damsel in distress you find along the way.
Song: Calling Out Remix By Lyrics Born
It's an upbeat, slightly egotistic, anthem with a backbeat you can fight to ... and it doesn't sound so bad on infinite repeat either.
Celebrity Guest: Bruce Campbell
Look, I know it's cliche and I know old Bruce is an actor and hasn't actually defeated an army of darkness before, but c'mon - it's Bruce freaking Campbell and zombies. That's like peanut butter and chocolate for the most part. Plus, I would assume Bruce would be irrationally optimistic in such situations, which is the kind of attitude I would want around.
A co-worker offered up Simon Pegg as a reasonable alternative, should Bruce be otherwise occupied by 100 other requests.