Just done a spell check on something I am writing to discover Birkenstocks comes up as laughing stock. To be fair it should’ve been Crocs – the devils shoes.
Also cringingly (which I’m not sure is really a ‘word’) came up as carol singer
Aint that a kick in the head?
Jen S. Wight 
Back in the days when Birkenstocks weren’t so common to the feet of England – when I was about 8, I think – my class had an American exchange teacher for a year. Apparently she’s always remembered a comment from one of my classmates, regarding said footwear:”Those are some really ugly sandals, Miss!”