Debra Jo Hunter, 52, was sentenced to 30 days in jail on misdemeanor assault
She was charged over coughing incident in a Pier 1 store on June 25 of last year
Coughed on cancer patient Heather Sprague after displaying the 'double bird'
Hunter became irate when Sprague started filming a tantrum over returns
'I'll get real close to you and cough on you' Hunter said, then carried out threat
'Oh my!' exclaimed judge as he viewed video for the first time in court
Judge James Ruth berated Hunter for her lack of remorse at sentencing