My grandfather had a story from his shtetl, Boiberke, where he and another boy once brought a horse into the Beis Medrash and tied it to the Bimah. The shamash, Reb Chaim Abbaleh, walked in and told them it was a fahrbloonzit neshoomeh fun anderre velt (lost soul from the other world) and they had to fetch the Dayan to Mach a Tikun. This required putting a Tallis over the horse (who did not agree to accept the Tallis) and while they were working on this my great grandfather and other men came in and told Reb Chaim Abbaleh that the two boys were making a fool of him, and so they released the horse and it ran away.