Gardai arrested the 17-year-old at the Great Hall in the Criminal Courts of Justice on Parkgate Street on January 15 last when a row broke out among feuding members of the same family.
The teenager pleaded not guilty to a charge under the Public Order Act for engaging in threatening, abusive or insulting behaviour, in connection with the incident.
At Dublin Children's Court Judge Ryan said it seemed that the teenager had lashed out in response to his relation's actions and dismissed the case.
Escape from Alcatraz death
For the first time in its 33-year history, a participant in the world renowned 'Escape from Alcatraz' died during the event.
The death of Ross Ehlinger (46) on Sunday during the swim portion of the event – held in the frigid San Francisco Bay amid 6ft (1.8m) swells and a powerful outgoing tide – raised questions about what effect the tough conditions had.
Cancer-stricken president worse
A new and severe respiratory infection has hit cancer-stricken Venezuelan President Hugo Chavez and his breathing has deteriorated.
Communications Minister Ernesto Villegas said Mr Chavez's "worsening respiratory function" was related to a weakening of his immune system. He said the socialist leader had "a new and severe infection".
Mr Villegas said Mr Chavez had been undergoing "chemotherapy of strong impact, among other treatments".
Zoo monkeys around for baby
Zoo workers in Cincinnati are imitating apes to help raise a baby gorilla.
They wear all-black outfits, grunt affectionately, and try to resemble mother gorillas to help the baby adjust to its new home and get ready for a surrogate mother.
As the baby grows they plan to don hairy vests and carry it on their backs, possibly climbing trees and knuckle-walking.