Just found this. Maybe some will find it amusing.
Sorry for the link, but its in swedish. Here is a translated short recap.
Anders Norrman, 15, had been over to a friends house when they suddlenly see the one of the neighbour rushing over calling on them to call the police. At the same time he sees a 40 year old man beating up an elderly woman though the door to that neghbours house. He sees red and rushes over.
After some fighting he gets the burglar in a "bensax" (note, difficult to say what the reporter means -its translates literaly to "leg-scissors". some kind of hold using legs), saying "you dont have a chance, Im swedish champion in judo". After 10 minutes the burglar stopped trying to escape the hold, and after 20 minutes the police finaly arrived to take him into custody.
Norrman became swedish junior judo champion last spring.
As a award he got a diploma from the police, cake and some money :-)