Enter the following secret chat commands (without the quotes) in the chat log as if you were going to say this to somebody to make everyone's head and hats look either very big or small. Type the code once to activate and again to deactivate.

Big Heads and Hats:
Type '/absnbd'

Small Heads and Hats:
Type '/omglilimh'

The followinging items become available by selecting the 'Redeem-A-Code' option and entering the corresponding code. These codes can also be used in-game and items are limited to one use per account. These items can't be traded and some cannot be sold.

Unlocked Striped Shoes - Level 1 'Free Job' Clothing:
Enter the code KN78CH2

Unlock Charcoal Bermuda Shorts - Level 1 'Free Job' clothing:
Enter the code 6TNBTGH

Unlock Robgoblin T-Shirt - Level 1 'Free Job' Clothing:
Enter the code ROBGOBLINBOOTY

Unlock Twilight Layered Skirt - Level 1 'Free Job' Clothing for Females:
Enter the code MPT38B3

Unlock Mother's Day Bouquet - Level 1 'Free Job' Item (limited time):
Enter the code ROSESFORMOM

Unlock Doggy Bowling T-Shirt - Pet Clothing:
Enter the code JFRE87J

Veggie Surprise (turn into fungal man-eating plant):
Enter the code FACEBOOKFANS01

Unlock Spider Snack (turn into shaggy spider):
Enter the code CMNJGGE

Unlock Froggy Fries (turn into a Frog):
Enter the code FACEBOOKFANS02

Unlock Goat Cheese (turn into a goat):
Enter the code FACEBOOKFANS03

Unlock Checker Charged Helmet - Level 1 Kart Driver Item:
Enter the code FACEBOOKFANS06

Unlock Crystal Hammer - Level 1 Brawler Weapon:
Enter the code N4PF9R3

Unlock Shadowblade - Level 1 Ninja Weapon:
Enter the code FACEBOOKFANS04

Unlock Dynamite - Level 1 Miner Tool:
Enter the code FACEBOOKFANS05