Ultimate fighter Chuck Liddell may be known for his swift kicks, take-down defense and knockdown blows, but he has an Achilles heel: The smooth and creamy flavor of peanut butter.

When he's working out, he rolls a wheelbarrow of rocks up a hill. When he's breaking his diet, he reaches for a spoon and a jar of PB.

We asked Chuck to blindly taste a range of peanut butters, from a kooky white-chocolate peanut butter to that after-school special, Jif.

Read which PB won his Peanut Butter Smackdown.