To see a whale is a once-in-a-lifetime experience unless you spend time often under the sea (which is impossible unless you’re a researcher).
Whale watching tours can be expensive to do every day. Going to one, you’d wish the whale would come up or even the dolphins so you could see them at least once.
Whale watching is a profession and they’re often lucky to see whales. While they may not consider seeing whales a once-in-a-lifetime experience, they would consider seeing its baby, as.
A whale came onto their boat. They recognized it as a baby whale. Then the mother of the whale arrived as if telling the watchers to video her child and make her viral!