“My head gets cold at the drop of a hat”

“At the drop of a hat” means without hesitation (instantly). The phrase usually does not literally involve a hat, but there are jokes.
     
“My head gets cold at the drop of a hat” was posted on Twitter by Jäymän on February 22, 2011. “My head gets cold at the drop of a hat” was posted on Reddit—Oneliners on August 26, 2011.
   
       
Wiktionary: at the drop of a hat
Prepositional phrase
at the drop of a hat
1. (informal, idiomatic) Without any hesitation; instantly.
     
Twitter
Jäymän
@JayTheOkay
My head gets cold at the drop of a hat.
6:34 PM · Feb 22, 2011·Twitter Web Client
   
Twitter
Ms. Monster
@SpacePlankton
My head gets cold at the drop of a hat.
6:09 PM · Dec 10, 2013·Twitter Web Client
     
Twitter
Nick Mao
@NickLMao1
You think you get ill easily? I’ll get a head cold at the drop of a hat.
4:03 AM · Jan 27, 2014·TweetCaster for Android
 
Twitter
Jeremy C. Shipp
@JeremyCShipp
My head gets cold at the drop of a hat.
3:08 AM · Nov 19, 2015·Twitter Web Client
   
Twitter
Rakesh Chopra
@rakesh10chopra
My head feels cold at the drop of a hat.
6:22 AM · Jul 5, 2017·Twitter for iPhone
 
Reddit—Oneliners
Posted by u/zachpledger August 26, 2020
My head gets cold at the drop of a hat.