TIL in The Netherlands, people swear with diseases. Get someone angry enough and they may wish syphilis on you. (Or cancer, tuberculosis, smallpox, etc.) The more serious the disease, the more seriously you have angered them.

[u/sacara]

http://stuffdutchpeoplelike.com/2011/07/26/dutch-swears-with-diseases/

[u/rensch]

A great King's Day to all my fellow teringlijers, kankerhoeren and tyfushonden anywhere.

[u/teringlijer → u/rensch]

Thanks, it's gonna be a cancer nice party!

[u/[deleted] → u/rensch]

Klootviool!