at the drop of a hat

“There’s probably never been a time in human history where you had so much extremely graphic violent imagery that not only was available to you at the drop of a hat but also that, in some cases, whether you wanted it or not, might end up showing up in front of you,” says Craig Silverman, co-founder of Indicator.

They're a defence that goes to pieces at the drop of a hat.

You can't find me a boxer from middleweight to heavyweight who wouldn't fight Paul at the drop of a hat for the type of money on display.

"He bought Twitter so that he had clout and would be able to - at the drop of a hat - reach hundreds of millions of people," Donovan said.

Famously, they'll take requests from the audience, often playing other artists' songs at the drop of a hat.