Step 1: Required materials
One empty cereal box from a Kellogg's Cereal Variety Pack - I used Frosted Flakes, but you can choose your favorite cereal. It will not impact the outcome of this project. ;-)
Not required, but helpful: Soldering iron
Step 2: Remove speaker from card
Cut the speaker wire at the base of the circuit board first and then gently remove the speaker from the card. If you don't cut the speaker wire first you could end up ripping the wire from the base of the speaker and then you'd really need a soldering iron.
The speaker is fixed to the card with a small circular piece of double sided tape, so it shouldn't be too difficult to remove. Avoid the urge here to use your utility knife to "cut away" the speaker - you could accidentally cut right into the speaker itself.
Finally, strip about a quarter inch of insulation from the wires.
Side note: In case you're wondering, the Hallmark card is powered by a CR2032 3V Lithium Battery. This is the key ingredient for making an LED Throwie and is the power house for a bunch of other Instructables. The battery isn't necessary for this Instructable, but holding on to it could prove to be handy down the road. ;-)