I had some old flowers in a vase and noticed the water had become really stagnant, causing the whole room to smell like a fart. So I tipped out the flowers and the old water, and poured some boiling water into the vase to help clean off all the slime. To my surprise the vase started ringing like a bell! The sound was quite loud, similar to when you run your finger around the tip of a wine glass. I believe the vase is ceramic, I'll attach a picture of it below.
How is this possible?