Yes I have a tb gelding, goes to pieces if anyone new rides him...gets a very stressy, fearful look in his eyes and marches forward..He's pretty scarred up, got him on loan and then was signed over. Seems that he didn't have the best past before hos old owner got him. He was petrified of brooms, whips etc.. Has come through it now but has only just accepted my instructor riding him over the past few months, threw a right paddy when she first got on him.. funnily enough he's good as gold with kids.