For those of you scratching your heads, it's a combination of the guy in the cave who says this message and the heart container that gives you precious extra life.
The idea for this card comes from kate12345's Pixelated popup card Instructable.
Step 1: Print!
Step 2: Cut!
Step 3: Fold!
Step 4: Glue!
Step 5: Give!
Pro tip: Life heart is even better when combined with other goodies, like chocolate, flowers, or a power tool.