Well, it could be that Naruto pranks the clans to test their reactions and sense of humor. Maybe he uses simple tricks like fake summons or changing the appearance of clan symbols to see how they respond.
Perhaps Naruto pranks the clans as a test to see how well they know their own traditions. He could set up scenarios where the clans have to rely on their knowledge of their heritage to figure out what's going on. For instance, he might change the location of a clan's sacred item and see if they can find it using their traditional methods. This would not only be a fun prank but also a way for Naruto to gauge the clans' connection to their roots.