Do You Remember What You Did this Midsummer's Eve?

From the introduction: It is 2013, and Midsummer's Eve. A couple of students have been partying in a summer cottage on an island in a remote Finnish lake. During the evening everybody drank too much Russian vodka and lost their memory. In an attempt to get home they ran over a rowing boat drowning the person inside, a young fisherman called Antti Saari (Finnish for island). The actors' motorboat ran ashore. Everybody passed out.