Your boss is allowed to try to intimidate you into quitting, or make the work environment so unpleasant that you quit. He can have a co-worker present and make comments about you (with one limitation: if the frequency of your bowel movements is due to an actual medical condition--and you'd need a diagnosis or other medical support--they may be committing illegal disability-based discrimation or harassment, and you may have a legal claim; if you think this is the case, you should speak with an employment law attorney).If you don't have a contract, your boss doesn't even need to try to get you quit--he can fire at any time, for any reason. Employees without contracts have almost no rights in or protection for their jobs; they are known as "employees at will."