Robin Roberts puts Valerie Harper on the spot and asks her to loop a line of dialogue from 'The Mary Tyler Moore Show' on 'Good Morning America' (weekdays, 7AM ET on ABC).

Harper is currently starring as actress Tallulah Bankhead on Broadway in 'Looped,' a production based on an incident where Bankhead took eight hours to re-record a single line of dialogue for her last movie 'Die! Die! My Darling!'

Watch the video after the jump.Robin Roberts puts Valerie Harper on the spot and asks her to loop a line of dialogue from 'The Mary Tyler Moore Show' on 'Good Morning America' (weekdays, 7AM ET on ABC).

Harper is currently starring as actress Tallulah Bankhead on Broadway in 'Looped,' a production based on an incident where Bankhead took eight hours to re-record a single line of dialogue for her last movie 'Die! Die! My Darling!'

Harper does well, but pretends to be outraged after the challenge. "Wasn't that terrible? I'm a professional! You're exposing me to ridicule to hundreds of millions of viewers!" Harper loudly exclaims, swatting Roberts with a piece of paper.