Our toilet started doing this when water goes down the tub drain..is it something that needs to be addressed right away?

So we just moved in here a little over a week ago, and the toilet wasn't doing this at first.

It only happens when water goes down the tub drain.

I know my boyfriend said he clogged the toilet monday night, and it started after that..but idk if the two are connected or not. I'd be pretty impressed if he took a shit big enough to fuck up our plumbing though.

Anyways, it's Christmas so I dont really want to bother my landlord about this, but wondering if this is something that needs to be addressed ASAP or not.