Reminds me of feeding black licorice "Drop" to non Dutch people, make sure napkins or a trash can is nearby for them to spit it back out.
I had what may be an equivalent experience when I gave a bag of Reese's Peanut Butter Cups to my Italian hosts. One adventurous set of tastebuds out of the bunch had led me to believe they'd be a good gift. People were practically knocking each other over looking for a place to spit :-)
https://en.m.wikipedia.org/wiki/Polyglycerol_polyricinoleate
https://www.gourmetboutique.net/blogs/tasting-room/17250043-...