A study for tractor fans of a certain inclination, but not for everyone:
“Suicidal Decapitation Using a Tractor Loader: A Case Report and Review of the Literature,” Stéphanie Racette, Truong Tho Vo, and Anny Sauvageau, Journal of Forensic Sciences, vol. 52, no. 1, 2007, pp. 192–4. [AIR 16:2] The authors explain:
The head was recovered in the loader… This very unique case of intentional suicidal decapitation is the first reported case of a planned system intended to create decapitation outside the unique case of homemade guillotine and the more common decapitation by train.