bright spark
noun [ C ] UK uk/ˌbraɪt ˈspɑːk/ us/ˌbraɪt ˈspɑːrk/
生气勃勃的人；精明的人
a person who is intelligent, and full of energy and enthusiasm
humorous蠢人
a stupid person
Some bright spark left the door open overnight. 哪个“聪明”人让门一整夜都开着呀。