I can't actually believe it, but I've actually met people who've never had S'mores. Or, worse, they cook them in an oven. 
1 bag large marshmallows 
2 6-packs hershey's chocolate bars 
1 box graham crackers
Start a fire. 
Take a long, green stick, (that means "still alive" - but be careful how you obtain it. No rhododendrons or pine. Get one that looks easy to peel. You want it to be about the same size as your finger, preferably tapering to the top. You're going to stick marshmallows onto it, so be reasonable!) and peel the bark off of it. Stick two marshmallows onto the stick.
Get one graham cracker. Break it into half. Get about three squares (or two, depending on your sweet tooth) of chocolate and put it onto one half of the graham cracker. Place that near the fire (one of the stones in the fire ring works well) and get it nice and warm.
Toast your marshmallows. (No, I mean over the fire. Don't put a marshmallow into your toaster.) I, personally, prefer the "Burn It Baby!"  Method, but toasting the marshmallows to an even golden brown leads to a good, gooey inside perfect for s'mores.
Oh - watch your marshmallows so that they doesn't fall off the stick into the fire. That's a waste of good marshmallows. When it's so gooey that it's about to fall off, that's when you need to make your s'more. Promise.
Pick up your bottom half (that's the cracker with the warm chocolate on it) and place it directly under your marshmallows (they should still be on the stick). Get someone else to hold the stick for you, or put the other end between your knees, and place the top of the cracker above the marshmallows. Using the two crackers like scrapes, drag the marshmallows off the stick.
Mash together, and eat, getting the maximum amount of marshmallow and chocolate on your face and hands as possible. It's the only good way to eat S'mores. Napkins are optional.
 Or even worse, a microwave.
 The big ones, not the wimpy "mini" marshmallows.
 Grocery stores do sell 'em in packs of 6.
 You know, fire. It uses wood, and matches, and large, large amounts of newspaper.
 If you want to put a marshmallow in your toaster, I can't stop you. But don't get near my toaster.
 Leaves marshmallow with outer crust of blackened stuff. Inside usually cold. However, makes excellent, if short-lived, torch.
 Napkins are always optional.
 This is a camp recipe, honed over a decade at Camp Mary Atkinson, in Selma, NC. Napkins are usually forgotten, so they're always optional.