It's part of their brand of pickyness - everything must be 'just so' (They do have German influence).
Glasses in Europe tend to have a 'fill line', an official mark to designate the volume and ensure that you're getting a full pour.
Scraping the head does two things:
- They can fill the...
Blame it on the Belgians. Talk about snooty!
They do make some really good beer (besides Stella), and are very picky about what glass it gets served in.
"I can't sell you that beer, we don't have the right glass for it"