I have five product managers I support. Most of them are bright enough to fill out their own damned expense reports. One of them--the "mistress" that's been driving me a bit batty--isn't, she just gives me a large pile of receipts with notes written on them.
Today, she corrected my work--that's okay, I need to know how to do these things. After I'd blown two hours on it, trying to sort her little scratches into a spreadsheet, she said "I think we're coming to an understanding about our system."