Quick fun question for yall: What are your top 3 favorite enemy types to use in games? And do your players know to expect them?

My top 3 favorite enemies are always:
1) Undead
2) Regular humans or humanoids
3) Plants

My players know there will always be undead somewhere lol

@Miru Humans mostly, I've a big "the greatest monster was us all along" streak. Also a Big Fan of eldritch gribblies that don't always obey the cause/effect mechanics players come to expect, especially if there are good rules for fear and sanity. Faeries in Changeling, Demon Lord or Exalted are Lovecraft tier horrors and I love them for it.