This is a very good idiom: at the drop of a hat

6년 전

My niece cries at the drop of a hat.
Some people get married at the drop of a hat. 

It's a fun idiom you can use for your IELTS or Cambridge speaking. It's also a fun idiom for everyday conversation.


at the drop of a hat
INFORMAL without delay or good reason."he used to be very bashful, blushing at the drop of a hat"