If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threadspage before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
The major falsifiable prediction is that reminding people of their own mortality will cause them to increase the strength of their psychological terror defense mechanisms, which may include culture, religion, or social ties. Here is a literature review of the subject from 2010. According to the review, the theory hasn't been falsified:
Can it predict something real/measurable?