When you try to create an account on Samsung.com, it gives you 4 circles to check. One of them is optional, but when you click a fifths checkbox that says "I have read and agree to all the above," it also checks an item  "News and special offers," that's optional.  

Samsung decides that you definitely need the optional item without providing this choice for you. This is a good example of a dark pattern called Privacy Zuckering when a service tricks you in order to get more information. In this case, it's your email where all the promotional upselling emails will be sent.

The best solution would be to keep the optional item unchecked and leave it up to the user to decide if they need it or not.

Found by Arvid Kahl