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M1 Carbine or S&W Repeater Rifle.

Depends on the circumstances.

If I suddenly find myself in a sealed room, alone, surrounded by relatively slow-moving zombies, I'd use a blade. A long one.

Not too heavy, but not too light either. Too heavy, and you tire your arms out. Too light, and it lacks the weight to behead anyone.

I'd go with a long katana-ish sword. Razor sharp, of course, or I'm screwed.

No short blades, you can't wait for them to get in too close to you. And even if you've got lightning-quick reflexes, there's still a chance of blood spurting into your eyes and mouth if they're just a foot or two away from you.

However, if you're in the middle of a city street or something, with a fair about of room to maneuver, a fast-reload gun would be much better. I'd go with a P90. Not that much range on it, but easy to reload and easy to use. And especially, easy to carry...nothing weighing you down, like a semi-machine gun or any crap like that.

A M1A2 Abraham tank. Totally. 'Would make my day.

I've got a bunch of nifty craft knives next to me right now, try and stab them in the head or spine, kill and paralyse.

I would choose a flamethrower because I could burn all those motherfuckers.

Invisibility potion. Can't hit what you can't see.

Shotgun and baseball bat. That would be orgasmic.

He looks like he could use a shotgun to the face.

Get a chainsaw and strap it too a cricket bat.
Whack one in the head, then spin around and decapitate anything behind you.

I would take mah Trailmaster and unlimited Grenades and Bazookas? Pic from Trailmaster below :|

Computer mouse

The only thing closest to me to a weapon is are scissors, chips, screwdriver and a glass with a spoon on it. I will definitely die.

I use plants lawl