臭氣

臭 = 犬 + 自 : Charlie Chaplin (ch) has not showered for days and is very stinky (臭). In the outhouse's bathroom (ou4) the Saint Bernard dog (犬) even holds a mirror (自) in front of him to let him see how filthy he looks.

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.