I’m forever looking up what actions provoke an attack of opportunity... Needless to say I have my DM’s screen at hand, even when not DMing.

Grappling is needlessly complicated in your defense. I had 3 pages of rules on grappling printed out from the SRD that was stapled to my monk's character sheet.

As for my answer: 5 foot step. I always maintain the correct answer, but it seems to be challenged by someone more than any other rule :-p

Nonleathal damage because of devryguy's monk.

:D

Like . . some special attacks get interrupted by an AoO, like grappling or disarm, but trip goes through? Or did I forget it again?

Grappling for me as well. I love the idea (and I theoretically love the mechanic--a way to attack someone which isn't actually attacking), but even when I find the group grappling in every battle, I still have to look up the rules.

Actually, the same applies to stuff like Disarm and Trip, but I don't use those as often.

Grappling in and of itself isn't all that hard to remember. It's what you can and can't do and what everyone else can and can't do to you that makes it hard to remember

That's what I mean.

two weapon / double weapon fighting.

feats needed, penalties that apply, that stuff. Every time I think I got it, someone challenges and we have to look it up.

And grappling.

The grappling rules I almost have a *ahem* handle on, but for some reason the turning rules will not lodge themselves in my brain after six years of playing/running 3.X.

Chalk up another for grappling.

On the other hand, I won't even TOUCH turning/rebuking. Undead don't even show up in my adventures. :P

Part of the problem with turning is that past 5th level, no matter who is doing the turning, if the encounter is close to even CR, the turning is going to fail.

If the encounter is well below even CR, why are you bother to run it in the first place?

(Because, in general on-par CR undead have more hit dice than the PCs and have turn resistance. if the undead have 5 more in turn resistance and hit dice than the PC, they're immune to an on-CR turning attempt.)

grappling for me too. That section always requires reading it seems.

Haste.

I don't really understand what it is with my players and the damned Haste spell, but they seem to think any number of things, such as:

-a "5 foot step" becomes a "30 foot step"....what are you thinking?
-it grants an extra standard action per round


I mean, I understand that Haste has undergone some changes even from 3.0 to 3.5, but come on. =\ If you're gonna be casting the spell, you should know what it does and be able to explain it to your fellow party members.

Agreed. Not Haste in particular, but spells a-go-go. They take the name and just assume it does what it says on the tin. At least twice now, I've had to explain that when Spellcaster uses Invisibility Purge, Rogue can't just "reboot" his Ring of Invisibility by taking it off and putting it back on.

I've been thinking of requiring players to copy the full description of any spells they pick up from the PHB into a real handmade "spellbook" just to make sure that they've read through the whole thing.

I would have to be a spontaneous caster in your campaign...

I like that idea.

Offtopic first =)
Misread the heading as "Forgotten or hard to find Realms"

A. Spells.