People get into their own little bubble when they take selfies. Every year there are hundreds of cases of people falling off mountains or getting hit by cars just so they can snap the perfect photo. At least they have something to show for their deaths. Not everyone can say that. Some people choke to death and all they have to show for it is an unfinished meal.
This picture perfectly roasts our intense need for selfies, claiming that even in the literal mouth of danger, people would still be more focused on the picture. Think about it though. If you ended up in the mouth of a shark and weren't torn into hundreds of pieces, you had better take the opportunity to snap a photo. After all is said and done you could always use the selfie stick as a weapon.