jon stewart announced the date of his final show live on air , joking he would ` wear a suit and shower '
` i live in a constant state of depression . i think of us as turd miners , ' he said .
stewart also confessed that his ` moments of dissatisfaction ' with the show had started to become more frequent .
comedian said he did n't have many regrets , but one was not pushing donald rumsfeld harder when he had the chance in 2011 .