If you tried to block Jimmy Fallon's performance in Taxi out of your mind, this video may be triggering to you. Robert Downey Jr. stopped by The Tonight Show yesterday, and decided to do a little impromptu acting class with Fallon. He directed him in a few dramatic scenes, and Fallon's performance will make you say, please, "don't quit your late night job." 

In Fallon's defense, how could you not laugh when Iron Man prompts you to do a very serious scene about a post zombie apocalypse car chase that comes to a grinding halt due to gassiness?