Bathroom Gremlins?

So Sarah and I went to Maine to visit my mom this weekend, when I got back, the shower curtain was down.

Ok, kinda weird, but it’s only held in by pressure, and maybe somehow a change in temp or humidity cause the shower walls to bow or something, and the rod fell.

I shrugged it off and put the rod back up.

This morning, the drain was completely clogged, and a shower resulted in a full tub of water.
Now usually, the drain is a little slow sometimes, but this is full-on clogged. Water not moving *at all*.

I tried a plunger, it did nothing.

So I poured in a bottle of drain cleaner, we’ll see if that has any effect at all. I’m not sure if it will just become diluted in the full tub of water.