Oof. Well, the first thing I'd do is call the landlord and ask what their process is for these things.
Assuming you're on your own, time top plunge. Go buy a new plunger, don't use the one you've only used in the toilet. If that doesn't work, then it's time to undo the u-pipe, and I'm not that girl. But if I were forced, I would.
How'd it go?
* Charter member of the BBB I Love Brussels Sprouts Society
* I do not fix my typos. I shuold, but I dodn't.
* I regret tucking my jeans into my socks with Reebok high-tops well into 1994.