欣喜

欣 = 斤 + 欠 : It's Marie Curie's (xi) birthday and someone sings her happy (欣) birthday in front of the encampment ((e)n1). The person gives Marie Curie a barbell (斤) as her birthday present, which makes Marie very happy (欣). The person attached an IOU note (欠) to the barbell though; Marie will have to pay for the barbell eventually.

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.