I never minded clowns until that one in the Stephen King story (the one pictured in Don Vercetti's post). I guess that's 'Pennywise'.
However...grew up ADORING Bozo the Clown, and Ronald McDonald was kind've a blast, too!!
There's a really sweet clown played by Jimmy Stewart in
'The Greatest Show on Earth' (Best Picutre, 1952). He was actually a doctor who had euthanized his terminally ill wife...and joined the circus to run from the law. Never removed his makeup in public so as to avoid being recognized by police. Good story.
I'm too young to remember Clarabell from Howdy Doody but I hear all the 50's kids loved him (right TIS???).
Except here's my all time FAVORITE clown....

Apple