By Emma Wilson & Tatiana Krisztina Some comedians believe penis jokes never fail – but this time it landed a bit flat when Jimmy Kimmel made Robert Downey Jr. the butt of the joke. The late-night talk show host poked fun at various celebrities in his opening monologue at the Academy Awards. His jokes ranged from slamming the Academy for not nominating Greta Gerwig for Best Director for her film Barbie to Robert Downey Jr.’s apparently awkwardly-shaped appendage. “Look at him, he’s so handsome, so talented, he’s won every award there is to win. Is that an acceptance speech in your pocket or do …