Jim Carrey does wonders with a slight premise that finds his reserved, emotionally-distant character, Carl Allen, a banker who routinely turns down loan applications, accepting a challenge to open up to life by saying "yes" to everything. A man who constantly disappoints friends by weaseling out of opportunities for bonding and happiness, Carl radically changes into a creature of complete spontaneity. By never saying no anymore, he gets into situations with unpredictable outcomes, such as driving a homeless stranger to a scary-looking park at night. But for the most part, whatever Carl says yes to becomes a road to worthwhile experiences, even receiving a promotion at work for approving hundreds of micro-loans against all policy. Zooey Deschanel, who often plays appealing kooks, is very good as Carl's girlfriend, a free spirit who takes to his positivity about everything, for a while anyway. Director Peyton Reed ( Down with Love) makes the most out of the gimmicky comedy, as does Carrey, who does wonders with scenes that are often left open-ended just to see what the brilliant comic will do with them. -- Tom Keogh