Coffee contains caffeine, but is usually not thought of as an energy drink.
   
“coffee IS an energy drink. The original and best” was posted on Twitter by Mike Givton on August 26, 2008. “Your morning coffee IS an energy drink…” was posted on Twitter by Jimmy Caplinger on January 25, 2011.“Coffee is an energy drink. Old school” was posted on Twitter by Salomé Jones on September 8, 2012. “Coffee is an energy drink” was posted on Reddit—Showerthoughts on August 6, 2021.
   
       
Wikipedia: Energy drink
An energy drink is a type of drink containing stimulant compounds, usually caffeine, which is marketed as providing mental and physical stimulation (marketed as “energy”, but distinct from food energy). They may or may not be carbonated and may also contain sugar, other sweeteners, herbal extracts, taurine, and amino acids. They are a subset of the larger group of energy products, which includes bars and gels, and distinct from sports drinks, which are advertised to enhance sports performance. There are many brands and varieties in this drink category.
 
Coffee, tea and other naturally caffeinated drinks are usually not considered energy drinks. Other soft drinks such as cola may contain caffeine, but are not considered energy drinks either.
 
Twitter
Mike Givton@HamCannon·Aug 26, 2008
Replying to @rhyolight
@rhyolight coffee IS an energy drink. The original and best.
   
Twitter
Jenny Taft
@Jenny_Taft
Heading off to run. I think I’ll make my first stop: Starbucks.  Coffee is an energy drink, right?
9:06 AM · Jun 30, 2012·Twitter for Android
   
Twitter
Olive OiLL
@oiL_Potisan
Coffee is an energy drink for me.  @ Hazel Taste Coffee Shop http://instagr.am/p/Ov6ZLtQoyc/
7:04 AM · Aug 25, 2012·Instagram
   
Twitter
Salomé Jones
@call_me_salome
@Emicka_Pixie Coffee is an energy drink. Old school.
4:01 AM · Sep 8, 2012·Twitter Web Client
   
Twitter
Tommy Walsh
@WommyTalsh
Me and many adults hate energy drinks, but adults dont realize coffee is an energy drink…
4:50 PM · Jan 16, 2013·Twitter for iPhone
   
Twitter
Alea Milham
@AleaMilham
When my 6 year old saw me going back for a second cup of coffee, he announced: “Coffee is an energy drink for old people”. 😊
5:51 PM · May 20, 2013·Facebook
   
Twitter
Paweł Stawicki
@pawelstawicki
Replying to @lkuczera
@lkuczera @ThisIsSpartez Coffee IS an energy drink 😉
12:00 PM · Jun 9, 2014·TweetCaster for Android
   
Twitter
Inactive
@BenjiEsports
@SigilsLoL @RiotLoote Tea is a relaxing drink, Coffee is an energy drink. Different uses!
12:16 AM · Aug 19, 2015·TweetDeck
   
Twitter
sue lannin
@suelannin
Replying to @SusanCarland
Coffee is an energy drink especially when you have a deadline!
4:20 AM · May 3, 2017·Twitter for iPhone
   
Twitter
Alexander Alguire
@ajalguire
What’s your favorite energy drink? Also coffee is an energy drink! #coffee #energy #energydrink #thursday
11:58 AM · Aug 30, 2018 from Utah, USA·Twitter for iPhone
   
Twitter
Mr. Farenheit
@joshwaldronsux
Replying to @MightyMonika
Coffee is an energy drink
1:59 PM · Aug 7, 2019 from Burbank, CA·Twitter for iPhone
   
Twitter
Antoninus Firebrand III
@LoneStarTexian
Replying to @UhOhNoGo
Coffee is an energy drink.
12:08 PM · Sep 6, 2019·Twitter for iPhone
   
Twitter
Dawtan
@Dawtan2
Coffee is an energy drink Eyes
7:13 AM · May 25, 2020·Twitter for Android
   
Twitter
Jelly Clarkson
@JonnyBeatz88
Coffee is an energy drink
11:32 PM · Nov 9, 2020·Twitter for iPhone
 
Reddit—Showerthoughts
Posted by u/finthir August 6, 2021
Coffee is an energy drink