Much as we love Kimi for dressing like a gorilla and falling over things, he is sometimes required to keep from drinking and do real work. This includes winning the Formula One World Championship and being in the army, apparently.
Räikkönen took his twelve months of mandatory Finnish conscription at a sports school, eventually becoming a non-commissioned officer.
Not being from Finland, it's hard to know if Finns take the world champion's military service seriously, or if this demonstration video is just something that they all laugh at.
(Hat tip to Matej!)