Downeys first prompt for Fallon was certainly strange.
Theres a knock at the door, you open it.
Theres a beautiful girl there who youve been in love with.

Credit: NBC
You thought she was dead, Downey said.
Lets pretend her name is Harmony.
Then you realize youre gonna have to kill her.
The camera zoomed in on Fallons face as he responded, Harmony…?
in a frightened voice, playing a mix of emotions on his face.
Downey called it a success.
The next prompt came from things Downey found hard in acting in this case, driving.
Youre behind the wheel.
You just got away.
Zombie apocalypse, Downey said.
But that car that you ran off the road, theyre back!
Wait a minute youre feeling gassy.
Watch the clip below.