This is the appropriate reaction, IMO.

If you go out fishing, it’s pretty easy to guess what you’re going to catch. Certain areas are known for having a relatively short list of fish, so aiming for a trout and getting a giant sea squid is a pretty rare occurrence.

That said, miracles can happen. In this case, these dudes were out on their boat when they were met with not a delicious fish, but a massive shark. The video cuts off before we learn how they resolved the situation, but their shock about the whole thing is palpable.