An over-the-top fanatic of Jamba Juice, aggressively promoting the dietary benefits to anyone within earshot. Typicallt sneers at diets of energy drinks, Good & Plentys, licorice, and donuts.
Pam: You really should give up the Monster drinks and switch to something healthy, like Jamba Juice.
Mark: Wow. You're such a Jambassador. Give it a rest.