Step 1: Get infected ingrown toenails.

Step 2: Get a doctor to perscribe Keflex (an antibiotic).

Step 3: Take one of those bad-tasting, evil-smelling pills, preferably without drink.

Step 4: Wait a couple minutes.

Step 5: Burp.

Step 6: Exhale.

Result: a bizarre white cloud appears in front of your mouth.