UX designers can channel the emotional energy of communication through the subtle visual language of their interfaces, like how some shapes, colors, and other design elements are associated with certain emotions. Some types of designs may promote users to 'communicate' with the product through this emotional design, evoking emotions that compel people to communicate.

Companies advertising limited time sales will sometimes speak less about how much shoppers will save if they do take advantage of the sale, and more about how much they'll lose if they don't

Advanced search filtering options in search engines are rarely used, partly due to the fact that users have to go through the mental effort of filtering for date, type of content, etc. Many users would rather keep scrolling for things than filter because that doesn't require much thinking. Even more likely than that, most users will just choose something from the first page of the first search they try.

People will tip more if the first tipping option is 15% rather than 10%, even if they have the option to enter a custom tip amount

In the menus screens/sidebars for a lot of social media sites, the home page is the first link, and the setting page is the last.

Contact links for customer service and such are deliberately made small links at the bottom of web pages because they're low priority targets, mostly because costumer service is expensive for the company. Also when the buttons to close ads are way too small.

If a streaming service has a ton of shows and movies, it becomes harder for people to figure out what they actually want to watch.

Someone thinks a specific diet is a miracle and will only listen to stories of people losing weight on it while dismissing cases where it failed

This is why it's good to have a face to your product, rather than presenting a large team that worked on it. Interestingly, it's also relevant in story writing, as the more main characters you have, the less readers will care about them. Some of the best stories have very few major characters.

This is a pretty big pitfall when it comes to UXD. To give a personal anecdote, I rarely, if ever, read what's at the very bottom of a webpage. That's why I think anything that's particularly important that you might consider putting at the bottom should go at the top instead, especially option menus.

I think this is something we all fall victim to from time to time. For example, if I'm playing a game and I keep losing, I may continue to play until I win, even if it's frustrating for me, because I don't want to feel like I've invested my time in nothing. It's also super common in gamblers, it seems.