Actor Johnny Depp has named and shamed the worst movie co-stars he's ever worked with - horses. The Hollywood star was dragged through mud and manure by the towering animals in the 1999 film Sleepy Hollow on director Tim Burton's instruction. And the mucky stunt has put him off working with animals for life. He says, "One morning when we were filming Sleepy Hollow, Tim called me to the set, pointed to two large horses strapped to a carriage and said, 'This is what we are going to be doing today.' "I was to hold on to the carriage behind the horses, being dragged along through the muck. The horses must have fed on curry. I've never smelt anything like that."