Why, oh why, would you want to swallow WD40???
 
Coz it makes you feel special!!! 

 
I love the scene in Withnail & I where Grant's character, desperate for alcohol, downs a can of lighter fluid. 
Then, upon seeking greater stimulation, hits upon the idea of chasing the fluid with Anti-Freeze. 
His co-star, McGann, then utters the immortal line;
 
"Don't be a fool - You should never mix your drinks"!!!!
 
Grant then promptly goes from a well-timed giggling fit to retching over McGann's shoes 
