We've heard that it's quite magical swimming with dolphins, and apparently, the dolphins feel that way, too. In fact, the story Jennifer Garner told on 'Late Show With David Letterman' (weeknights, 11:35PM ET on CBS) explains a lot about why dolphins are so friendly with humans.

It seems that Garner was training for a guest spot on 'Fantasy Island,' and one particular dolphin got up close and personal with her. Hmmm ... wonder if there's any dolphins in her new movie, 'Valentine's Day.'

Watch the video after the jump.We've heard that it's quite magical swimming with dolphins, and apparently, the dolphins feel that way, too. In fact, the story Jennifer Garner told on 'Late Show With David Letterman' (weeknights, 11:35PM ET on CBS) explains a lot about why dolphins are so friendly with humans. It seems that Garner was training for a guest spot on 'Fantasy Island,' and one particular dolphin got up close and personal with her. Hmmm ... wonder if there's any dolphins in her new movie, 'Valentine's Day.'