We're a small company and I still get cranky when they put our development URLs in screenshots or presentations. Or worse, give out dev phone numbers (which we reuse frequently for stuff).
Them:
They're not going to try it, they know it's development
Me:
So what, I would. (I'd probably do it during the presentation
)
You never know when a curious g33k type is going to see your stuff. I've probably accidentally broken some people's stuff before (or tripped various error logs at least).