An apple a day keeps the boredom away.
Step 1: Cut the Eyes
Knives are toys but they are sharp toys so don't cut yourself.
Step 2: Remove a Wedge to Form a Hinge
Cutting a wedge from the back will allow the mouth to hinge open.
Step 3: Use the Stem for a More Stable Hinge
I cut a slit in each half of the apple and then shoved the stem in at the peak of the hinge. Prevents the halves from sliding too much.
Additional features like ears and nose can be added as desired.