One rather frightening episode from when we lived in the centre of Sofia (not far from NDK park). We were sat in a coffee house (outside on a table as we had our dog with us). A car screeched to a halt, a few 'heavies' jumped out and shot a guy a few tables away (the staff explained it was a 'mafia' shooting), then the car roared away again.
Whilst it scared us half to death, everybody else just carried on drinking coffee etc., as normal, but taking a keen interest in proceedings thereafter!
The staff told us not to worry as 'the mafia keep themselves to themselves and wouldn't dream of shooting a member of the public'.