Ethanol (drinking alcohol) can be represented as C2H5OH. A joke is:
   
“Alcohol is never the answer, unless the question is ‘What is C2H5OH?’”
 
The jocular one-line saying was posted on Twitter on February 19, 2010.
 
Similar alcohol one-liners include “I know alcohol isn’t the answer, but it’s my best guess,” “I doubt vodka is the answer, but it’s worth a shot” and “Alcohol is not the answer; it just makes you forget the question.”
   
     
Wikipedia: Ethanol
Ethanol (EtOH), also called alcohol, ethyl alcohol, and drinking alcohol, is the principal type of alcohol found in alcoholic beverages, produced by the fermentation of sugars by yeasts. It is a neurotoxic,[15][16] psychoactive drug, and one of the oldest recreational drugs. It can cause alcohol intoxication when consumed in sufficient quantity.
 
Ethanol is a volatile, flammable, colorless liquid with a slight chemical odor. It is used as an antiseptic, a solvent, a fuel, and due to its low freezing point, the active fluid in many alcohol thermometers. The molecule is a simple one, being an ethyl group linked to a hydroxyl group. Its structural formula, CH3CH2OH, is often abbreviated as C2H5OH, C2H6O or EtOH.
 
Twitter
Pegs
‏@Miss_Peg
RT @Curtiee: Alcohol is never the answer… Unless the question is, “What is C2H5OH?”
5:42 AM - 19 Feb 2010
 
Twitter
funny humour
‏@funnyhumour
Alcohol is never the answer…...
  Unless the question is, “What is C2H5OH?”
10:01 AM - 19 Feb 2010
 
Facebook
best tshirt quotes
June 9, 2010 ·
Alcohol is never the answer…...
.
.
.
Unless the
question is, “What is C2H5OH?”
     
Twitter
Steven Winterburn
‏@5tevenw
Alcohol is never the answer…... Unless the question is, “What is C2H5OH?”
5:04 PM - 25 May 2011
 
Twitter
Paul Steele
‏@paul_steele
Alcohol is never the answer… Unless the question is…. “What is C2H5OH?”
10:45 AM - 3 Oct 2012