Amazing. You guessed right

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1. The car was hot-wired because the ignition-starter switch (I think that's the correct term) had broken down a couple of miles before customs. So they took me and my friend into custody and searched (for drugs, I suppose) the entire car with dogs and gear. I remember I heard them disassemble a lot of stuff on the car. Actually it was a bit extra distressing, since we had been to Amsterdam, and I got afraid that someone else maybe had planted something in the car. But they found nothing, so there were no problems.
2. Lie. I've never made my own fireworks, nor burnt down any house.
3. True. Got the calendar from a German friend who collect historical stuff, I was very happy, since I'm interested in history. I'm not sure if the Nazi party badge actually is authentic, but it looks authentic. I bought it from some antique shop.
4. True. This was of course a terrible experience, and I don't know why I was so stupid that I went up on an icy roof. The roof was actually not very slanted, but it was enough to make me glide towards the edge on all fours.