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
1. Humans/humanoids (typically with difficult or contradicting goals to theirs or their employers).
2. Aberrations (especially if they let me merge in some Cthulhu mythos stuff which most of my players never actually pick up on).
3. Umm...I don't know.
@Miru I have had players from multiple campaigns before say that they know I'm always going to make some sort of "standard enemy" seem really sympathetic (orcs driven to pillage because the elves destroyed the ecosystem of their land), and "standard interactions" into things that are troublesome (high elves attached to a caste system that makes them serious jerks to anyone that doesn't fit into that cleanly).