![dek](https://content.time.com/time/daily/2007/0710/peo_carrey_1012.jpg)
It's tough for some celebrity activists to be taken seriously and particularly tough when they are comedians best known for goofy expressions. But Jim Carrey couldn't have been more straight-faced at a press conference in New York City when he urged the U.N. Security Council to ban arms shipments to Burma, where the government crackdown is anything but funny.