氣胸

Mnemonic symbol: a balloon. The Queen of Hearts is disappointed by her balloons. She expected them to float upwards, but in the space station's bathroom, They float randomly in all directions.

胸 = 匈 + 月 : Xu Xian (xu) noticed Bela Lugosi (匈) is just going out when the full moon (月) is shining at the night sky and suspects that he is a vampire. Therefore, he plots against Bela and one month later, he rams a stake into Bela's chest (胸) in front of the engine ((e)ng1). Bela just feels a little chest (胸) pain but nothing more, since Xu Xian missed his heart.