Go ahead, ask them if they make cookies in a tree.
No, not drow, or aquatic, or any other elf "variant." I'm talking about your run of the mill NPC elf.
You don't see elves terribly often as encounters, probably because they are a PC race/class. What's interesting to me is that –on the surface– they look like a pretty simple low-level encounter, but there are a couple of things to keep in mind.
Elf (from Moldvay)
No. Appearing: 1-4 (2-24)
Move: 120' (40')
Attacks: 1 (weapon)
Damage: 1-8, or by weapon
Save As: E1
Elves are basically NPC fighters as far as attacks and weapons are concerned. They get the higher morale if their leader is present (and alive). Now, let's look at a couple of fun bits:
Each elf gets a random 1st level MU spell. There are 12 spells in the list, so odds are good some less common ones might turn up. If you run into several elves, though, you get a group with a bunch of spells (or possibly a particular spell multiple times!) at their disposal, as opposed to a PC group with maybe 1 or 2 spells in their arsenal.
By the book, the elves are listed as 1+1 HD. That means a d8+1 instead of the d6 the PC class gets. So they are a bit tougher than "normal."
If you encounter them at or near their home, now you have up to two dozen of them, led by an elf of up to 7th level! There's also a reasonable chance he has magic items. Admittedly, that's the upper end of the spectrum, but still within the scope of the rules.
Also, remember, Elves are neutral, so they aren't necessarily nice!