This ignores too many issues to be relevant. If something has a surprise, I can enjoy showing it to friends and watching them get caught by the surprise. That

This ignores too many issues to be relevant. If something has a surprise, I can enjoy showing it to friends and watching them get caught by the surprise. That adds pleasure. If something has a surprise, it can make a bigger impact and stick in my memory longer. That adds pleasure. Sometimes I can guess a surprise. That adds pleasure.