The most fun you'll have being wrong!
 
It's a simple concept.  Just add a number to the smaller thing to make it the same as the bigger thing.  Simple, but not easy.
The odds-maker must fill in the blank.  For example:
Number of teeth in a human +_____ OR Number of teeth in a great white shark
The oddsmaker must fill in the blank.  They think you must add 350 to a human to make it the same as a shark.
now everyone else bets on which side is bigger.  Human + 350 or Shark.
Which side do you think is bigger?  Bet right and you will get those points.  But if you are wrong the oddsmaker will take the points.
This family-friendly game for up to 10 players will keep you laughing... and scratching your head.  With wide-ranging questions from 5 different categories (money, geography, dates, science, and sports & entertainment) everyone will have a shot to prove how little they know.
It really is the most fun you'll have being wrong.