loose wire = screw loose: 某人哪根弦搭错了/你疯了
1)I think my boss has a screw loose.
He called me into his office but when I got there he sent me back to my desk!
2)A: Let's call Professor Porters about this math problem.
B: Do you have a screw loose? It's after midnight!
drop in/by:看某人 拜访某人
Glad you drop in
1)It was great to see you.
Drop in again
when you have free time. 很高兴见到你,以后有时间再来做客
2) I dropped by my grandmother's house after work. 下班后我去看了外婆
perk: 特权,额外津贴
Imagine the perks. 想想好处吧
1)Amanda's job at American Airlines has a great perk. She can fly anywhere in the world for free!