How about those times when they want a 'small modification' to a database driven system (i.e. and extra column in a database, or the form to work a bit differently)? It can take a bit of time to do that, unless the system developed is really simple (no
dependencies on other tables or libraries / very few columns).
You often end up having to edit stored procedures and recompile code (and check code if a columns datatype has changed) - although code generation can cut down the time taken by quite a bit.
I've also been doing PDF's (with iTextSharp) and it can take a long time to do modifications, especially if a certain layout or structure (page breaks after sections, cover sheets, tables etc) has to be maintained. Printer friendly pages are difficult as well
(compared to just doing them in HTML).