Reason #156: beautiful oleander trees adorn streets and seafronts
Besides looking and smelling wonderfully, apparently, oleander trees can also be poisonous. The 1999 Janet Fitch novel, and later movie, White Oleander has the main character (played by Michelle Pfeiffer) uses oleander to kill her lover.
I can say for sure that nobody has yet died of oleander poisoning on Brač :)