Here's one to test you no matter how long you've been here; what shuts in Jerusalem specifically on a Monday afternoon?
Misrad Hapnim is not the culprit (though it stands guilty of many other things) - it may have recently shut on Wednesday mornings "to improve service" but it's actually open on Monday afternoons.
Misrad Haklita is shut all day Tuesday and doesn't tend to have too much going on any afternoon.
Banks are not aware that it is possible to work in the afternoon hours (although they are open Monday evenings in many cases).
....and Misrad Hachinuch is simply never open.
The answer is hairdressers. I called the guy to whom I usually go at around 12:30 on Monday, in dire need of assistance, only to be told that they were just heading off for the day. I figured that I'd pop into one of the other 4 or 5 places that I pass on my way home, only to find them all closed as well.
Naturally Friday is their really busy day as everyone prepares for Shabbat so the Hairdressers' Union (if there is such a thing) seems to have decided that the day off to compensate is Monday.
So now you know!