This is a weird Bremen tradition where you get together with a group of friends and head out to the countryside loaded with booze. Then you start walking and at every turn or corner you take a drink from a little glass hanging around your neck. In between you fuel up with beer.
Surprisingly people tend to get a bit tipsy. After a couple of hours of walking & drinking you end up at a restaurant where you have unlimited food and, yes, drinks! The menu consists of different cabbage dishes, hence the name (kohl is cabbage in German). Top it up with sausages and you feel like a prince. After dinner there was a live band that we all danced to, then a bunch of us continued to a nightclub in Bremen called Modernes.
I am surprised I made it to the train back to Amsterdam the morning after. But we had lots of fun!