Uh-oh

So my sink started making a strange gurgling sound just a little bit ago. Sounded exactly like the bubbles from a large water dispenser (you know the ones I'm talking about?) I kept going over there to see what it was. Then Paul, my landlord, came over and asked me if something had overflowed. Apparently there is water running down the wall (not sure how fast) downstairs in the garage.
Oh dear.
I don't think it could have been anything I've done.
I hope not.

Poor Paul. Now he is downstairs hammering away at the drywall so he can find the leak.
Goodness.
Never a dull moment.