Remove from chocolate bar; break into sections along marked lines. For each drink desired, gently push and twist end of decorative wooden party pick until it goes through one chocolate bar section; add desired number of miniature marshmallows. Set aside.
Spread graham cracker crumbs on small plate. Spread marshmallow fluff along upper edge of martini glass. Roll rim of glass in graham cracker crumbs.
Combine vodka, half and half, syrup and ice in shaker (or water bottle with lid). Shake about 15 seconds. Strain into prepared martini glass. Garnish with prepared chocolate and marshmallow skewer. Makes 1 martini.