Erik mentioned only one part of the story.
Once upon a time I was in CPH and we were drinking beer (out of a can).
I drank mine and I crushed the can as I sometimes do after I finish a beer.
Erik jumped and screamed: "No, what are you doing? That can costs money!
Jakov said: "The aluminum is still here, can't you recycle it when squashed?"
Erik replies: "No, the can has to be intact!"
Go figure...
So, when I got back to The Hague, I did as everybody else would do, I started collecting empty cans because such policy doesn't exist in NL. I don't recall exactly but it did take quite a bit of time to fill up the suitcase and wait for my opportunity and the next trip to CPH.
Erik was surprised that I had a suitcase at all, let alone the largest I could get my hands on, because I came only for a weekend visit. Of course, as soon as he picked up the suitcase he realised that something was wrong because it was light (I couldn't crush the cans, you know why)...
The rest is history, already well described, so I ended up with a lump on my head...
Not to mention that we didn't get a penny for all those cans...
I must have a photo of the suitcase somewhere. If I ever find it, I'll post it here. I can't even remember when it was?