So Deadpool was being really aggravating and bothering Brother Voodoo. So Brother Voodoo cast a spell on him. Deadpool no longer has a body. And he's purple, too. So he can slip over someone's head and take over their brain. Giving him control of their body.

This is how the Merc With A Mouth was made:
Step 1: What you'll need: flour, paint markers, black sharpie, balloon, spoon, and a large funnel.
Step 2: Stretch the balloon. Using your mouth or a pump blow air into the balloon so that it inflates and stretches.
Step 3: Fill it with flour. Using your funnel fill the balloon with flour and poke the flour with the non-scooping end of the spoon if the flour jams the funnel
Step 4: Avoid a disaster.
Step 5: Tie a knot.
Step 6: Color with black sharpie and other markers to fit your needs.
Step 7: Enjoy.