You'll Never Laugh Alone is a song from Animaniacs. It is sung by Mr. Clown in Clown and Out.
It is a parody of "You'll Never Walk Alone" from Don't Let the Sun Catch You Crying".
"When you want to scream...
put away that frown and don't be scared of a clown...
Laugh on, laugh on, laugh on and on and on and on!
You'll Never Laugh Alone!