Digging up a sweet potato is not without risk (From: Stimulating stories from Northern Thailand; no. 24)
The sweet potato, the sweet potato
This story is about harvesting sweet potatoes. (*) You have to do quite a lot of digging and rooting to get them out of the ground! Sometimes you dig and dig and you don't see a single piece of potato. People sometimes dig very deep, throw water in, put a rope around the potato and only the next morning can they pull it out. No, you can't just dig up a sweet potato!
Now I heard the story of a man who wanted to dig up a sweet potato. He dug deep. Bowed deep and dug up the earth. The hole got deeper and deeper; it was a big beeper, you know. He knelt by it and dug. His dog had come with him; a black dog, Blacky.
Well, he dug and he knelt deeper and deeper until… he fell headfirst into the hole and got stuck. His legs dangled helplessly in the air without support. Then another gentleman passed by. He took a look at that, saw that the victim was firmly trapped in that hole and… he raped him on the spot! He sewed it while it was stuck. Then he ran away and stood at a distance behind a tree to see what was going to happen.
The poor man finally got out of that hole, looked around but saw no one! 'What now?' Well, the man actually liked it that way, better than with a woman… His sex drive was great, so to speak. 'Well, that was really nice! But who did that?'
Dog Blacky was happily wagging his tail; back and forth, back and forth…. 'Good God, the dog did it! It was quite tasty!' He crawled back into the hole, hoping the dog would do it again. But it didn't do anything. 'My ass, Blacky! My ass!' The dog did not respond.
The other man, further on, choked with laughter. "My ass, Blacky, my ass!" But Blacky only wagged his tail. Back and forth…
Source:
Titillating tales from Northern Thailand. White Lotus Books, Thailand. English title 'Digging up yams'. Translated and edited by Erik Kuijpers. The author is Viggo Brun (1943); see for more explanation: https://www.thailandblog.nl/cultuur/twee-verliefde-schedels-uit-prikkelende-verhalen-uit-noord-thailand-nr-1/
(*) The sweet potato, the sweet potato, in English yam, is an important food source and in developing countries it comes after rice, wheat, maize and cassava. Thai name: มันเทศ, man tea. I don't find anywhere that you have to dig so deep to harvest and I must have been told to color the story a bit...