Recently a Reddit user asked professionals to post something that's common knowledge within the industry but mind-blowing to the general public.

Since then, more than 8,000 people have replied with some shocking facts.

We pared down the most lurid details shared, including what percentage of children have a different biological daddy than they thought and why you shouldn't snort cocaine before going to the dentist.

NOTE: Reddit uses anonymous sources, which we can't verify. Posts are edited only for clarity.