Extreme cold and probably drugs having some weird effects on the brain.
We're hoping, for the sake of all humanity, that upon seeing the site of a truck containing its driver tumbling down an icy hill, people would be startled, shocked, horrified, or at least saddened. But this couple, traveling on a snow and ice covered Norwegian mountainside road, seem to find this accident funny as the truck starts to tip over the edge. We don't know what they are saying but their tone seems to come off as jovial, with one of them even laughing at one point.
People deal with experiences differently and with that much snow around, there may not be much to do in that area other than getting loaded. Then again these are Norwegians, the people that brought us Vikings. Savagery runs through their veins.