at the drop of a hat

if you do something at the drop of a hat, you do it suddenly and easily, often without any preparation.

I can't go rushing off to Florida at the drop of a hat.

We now have a situation where laws may be changed at the drop of a hat.

at the drop of a hat by AndreaA October 2, 2007

at the drop of a hat

at any moment

He would fart at the drop of a hat.

at the drop of a hat by The Return of Light Joker January 21, 2010