If this man is a Muslim, he may have been trying to "strike terror into the hearts of the enemies of Allah" (Qur'an 8:60). If he is not a Muslim, he is just an idiot looking for attention and finding a pathway to it by aping one of the most common news stories of the day; he almost certainly doesn't realize that by doing so he has just committed "Islamophobia."
"Man charged for playing Jihad bomber," from CITN, March 18:
(Grand Cayman - CITN) - A 35-year-old man has been charged and is expected to appear in court this morning (Friday, 18 March) following a bomb hoax incident.
On Monday afternoon (14 March 2011) a man called the 911 emergency communications centre claiming that he was a member of Jihad and had planted C4 in the Cayman Islands.
Later that day following a police operation in the West Bay area a 35-year-old man was arrested on suspicion of making a bomb hoax....