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		 Are you talking about his comeback special after Krusty gets cancelled, or when he is trying to reinvent himself as a comedian? 
 
The comeback special 'A Klown and his Friends' guest stared: Johnny Carson, Bette Midler, Luke Perry, Hugh Hefner and the Red Hot Chili Peppers. 
 
The other one, 'The last Temptation of Krust' guest stared:- Jay Leno, Bruce Baum, Janeane Garofalo, Bobcat Goldthwait, Hank Williams Jr. and Steven Wright. 
Obviously these are not all comedians but I thought I would just list them all. 
		
		
		
		
		
			
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				Round and round the shutter'd Square 
I stroll'd with the Devil's Arm in mine 
No sound but the scrape of his hoofs was there, 
And the ring of his laughter and mine.
			 
		
		
		
		
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