A couple I read / heard...
Apparently Duran purchased a LION to live with him at home, in keeping with his ferocious image as well as underlining the fact he is a total nutter. Roberto's party trick was to manually relieve the lion - and then to mimic the lion's expression of delight
Also one time he was training at a Gleesons, according to a Teddy Atlas biog, when this white collar boxer (a lawyer) asked if he could spar with Duran... who then didn't give a sh*t that he wasn't a real fighter and knocked him out cold and laughed.