“Endoscopic Removal of Sharp Foreign Bodies Impacted in the Esophagus,” Y.T. Jeen et al., Endoscopy, vol. 33, no. 6, June 2001, pp. 518—22
(http://dx.doi.org/10.1055/s-2001-15090). The authors, who are at Korea University College of Medicine, Seoul, explain that:The types of foreign body removed were fish bones (n = 9), press-through packages (n = 8), chicken bones (n =3), dentures (n = 1), and a wrist watch (n = 1).
(That’s an excerpt from the article “Improbable Medical Review,” published in AIR 14:4.)