A LOL Surprise looks like a pastel-colored ball that you’d throw around with your pet. What’s inside each of them varies, which is why they’re so fun. Some include tattoos and collectible trinkets.

Kids like weird things: Yellow sponge-boys, talking doe-eyed ponies, ruddy-cheeked rodents that say only “pika pika,” and, especially in the past few years, unboxing videos. Kids’ unboxing videos are ...