Sailing in the San Francisco is a beautiful, if often chilly, experience. It was made all the more so (beautiful, that is) for several women this past Friday when their encounter with a bottlenose dolphin was captured on video. The woman lucky enough to film the dolphin spoke with CBS 5, and described the scene to the channel.

“We were so excited and shocked, as none of us had ever seen a dolphin in the Bay," explained Julia Smith. “We were racing and they just showed up."

While sighting of dolphins near Ocean Beach are not that uncommon, this is believed to be the first video showing bottlenose dolphins in San Francisco Bay — an unusual (although apparently not worrying for marine biologists) occurrence.

Director of San Francisco's Golden Gate Cetacean Research Bill Keener told SF Gate that bottlenose dolphins only began hanging around the Bay starting in 1983 as a result of El Niño. And this is of course a year when an unusual number of sightings of other marine mammals like humpbacks have been happening in the Bay and on the coast.

The dolphin (or dolphins, Smith isn't sure if it was one or several) in Smith's video appears to be having quite the time — breaching repeatedly to chorus of delighted cheers from the women on the boat.

"We don't see it a lot here, but it happens," Keener told the publication. "They're big-brained animals, very intelligent. They're curious, and they see people in boats all the time."

Related: Video: Whales Breaching In Bay Freak Out Nearby Kayaker