On a 20-minute journey between Sweden and Denmark, people from both sides come together to drink and dance (to ABBA, naturally).
"It was hard for me to live a normal life as a parent. I needed to go back to prison to get some peace and quiet."
"On the most basic level, a human's life is not worth more than an animal's life."
We spoke to two specialists to find out if gurning can cause long-term problems.
Some dos and don'ts from Peter (74), Holger (64), and Adam (54).
"My mum claims I was really upset the first time I heard a sound. Apparently I just cried for ages."
Two weekends a month, Per Ulrich Karpf gets time off from prison, which he spends living it up in Copenhagen.
"The worst is when you're told that you can just snap out of depression as if it's just a matter of pulling yourself together."
Heavy breathing to a techno beat can be like tripping on hallucinogenic drugs.
"I wish I'd known I needn't feel obliged to talk about my genitals to random people at parties."