I have a player in my current game who is a cleric of death and magic. I freaked out one time when I looked at her character sheet and saw a wand of magic missile and a wand of lightning bolts.
me, "Why did you put this on your sheet?"
her, "you told me to"
me, "what was I on that night?" (just a figure of speech, in case you, or eric's grandma, cares)
Eventually I rembered she could use them due to the domain, but it was a funny exchange.
Oh, and now in the same game I have a warlock with UMD maxxed out. With deceive item, he has an automatic check of 25, even though he only has 6 warlock levels.