Investigators said two people, who are hearing impaired, were communicating through sign language at the bar, when someone mistook it for gang signs.   A fight soon broke out by bar patrons who attacked  and stabbed the deaf friends, and a bouncer was hit over the head and needed stiches.  All 3 people are expected to make a good recovery.  The bar brawl took place at Ocean’s Eleven Lounge in Hallandale Beach.