You could only do things on the site during government business hours.
On the surface it was frustrating, but it also made the site feel 'alive' in a way that I hadn't felt since the days when even professional company sites had an about page that the 'webmaster' created with maybe a pic of the server, or his cat.
I have an idea in my head for a sort of "banking" (not a real bank and I wouldn't use that word) app and that it would be amusing to have it recognize bank holidays and typical bank hours.