I helped a friend who had been engaged to shoot a wedding. No problem, right? Except when I got there, I found out that the bride really, really, REALLY wanted just a small portion of her wedding videotaped.
And there was no videographer.
To which I said - "Let's do it!"
I am not a videographer, although I know enough about dSLR videography to be dangerous . . . or, at least, to make a bride happy. So I grabbed my extra body, a Canon 7D, a tripod, and a coupe of cute, lil' ring bearers (hey, boys are good at screaming loudly on cue) to set audio levels. And made it happen.
The point is, a good photographer works to keep the client happy. Okay, people suddenly have an idea and they should have talked to someone about it ahead of time . . . but put out a little more effort and you can make their day just a little extra special.