Who am I on the phone with?

BART: (thinking) Uh oh... My mind drifted and now I forgot who I'm on the phone with... This is SO embarrassing... We've been talking for at least an hour...
BART: (thinking) Gah! Now there's a pause in the conversation... He's waiting for me... I gotta say SOMETHING!
BART: Uh... You're fired.
EMPLOYEE: Oh... Oh my GOD! My God, NO... (whimper)... BART: (thinking) PHEW! Good save...