Cartoon ceramic teacup - funny piglet with bubbles under base

Material 

- Ceramic

Conditions for Bubble - Spitting

- Condition 1: There is air in the pig's belly. If used multiple times, need to shake out the water in the pig's belly, just like shaking a mercury thermometer. 

 - Condition 2: Use freshly boiled water. If the water temperature is not enough, the air in the pig's belly and the external water pressure can't form a strong pressure difference, and it can't spit bubbles.