喜悅

喜 = 壴 + 口 : Mnemonic symbol: 喜宴, wedding banquet.

Marie Curie is overjoyed to announce her marriage in the space station. She improvised a wedding banquet with nothing but mandarins and notifies everyone by beating a large drum very quickly with two mandarins.

悦 = 兑 + 忄 : Yu the Great (yu) is operating a cash exchange booth (兑) in the elevator's bathroom (e4). He is very pleased (悦) that since he started displaying his enormous flail (忄) his business goes very smoothly.