One of the times I had this recently was an ERJ90 out of LCY, which is a slightly different proposition - but still pretty annoying. We were in the last row of CE and with the curtain open it was frankly a bit weird to have the guys right behind and across the aisle from us eyeing up our champagne and food...

aside from the fact that leaving the curtain open encouraged a constant flow of passengers to/from the forward lav

Same CSM on the return flight, and same thing happened (though towards the front that time so much less noticeable)

weird