S'mores can also easily be made in the microwave, for those times when it is not feasible to have a campfire.
Simply place the square of chocolate on one half of a graham cracker, top with the marshmallow, and 'nuke' it for just a few seconds...not more than 6 or 8...you have to keep a close eye on it.
The marshmallow will puff up enormously, and threaten to tip over and fall off the cracker. You don't want to clean that mess out of your microwave oven, so shut it down when it just starts to look like it might be 'thinking' about tipping over.
Top with the other half of the graham cracker, and enjoy as usual. ;-)
Also, if you have a gas stove, you can toast the 'mallows over the gas flame, just as you would over a campfire. This will give you the more traditional roasted flavor, ( minus the wood smoke effect), and for those aficionados of burnt mallows, yes, you can let them catch fire. But please, be very careful about doing this--remember--you are inside your house, not outdoors over dirt, and you don't want flaming bits falling on the floor!!! Done indoors, this part is best handled by adults.