This was posted by Stan Kegel on the groaners listserv.
Dr. Von Helsing was traveling by coach through Transylvania. The sun set just as he approached Vatra-Dornei castle. Suddenly, a bat flew in through the coach window and was transformed into a wild looking vampire dressed in a black frock coat with a long beard.
Afraid of being bitten, Von Helsing took a crucifix from his pocket and held it between him and the vampire.
The vampire looked at the cross, laughed and said, “Gornisht helfen.”*
*Yiddish for, “It wouldn’t help.”