Press Esc to display the pause menu, then type "loadthedice" and enter one of the following codes at the console window:
Extra money: chips
Get a hitman: hitman
Start kitchen fire: fire
People dance: danceforme
Drive around town: race
Dirty casino: puke
Get a trouble: makertm
Start convention: convention
More vomit: pukemore
UFO attack: ufo
Get 5 hitmen: hitmen
Get a cheat: cheat
Monster attack: godzilla
Big heads: heads