Be cautious. It’s a national trait explored on the first page of Modern-Day Vikings (2001). Labelled as “a practical guide to interacting with the Swedes” the opening lines quote the Hávamál, verses of Old Norse poetry dating back 1,000 years.
“Praise not day until evening, no wife until buried, no sword until tested, no maid until bedded, no ice until crossed, no ale until drunk. ”