Most of the hospitals do not have room # 13, and some of the tall buildings skip the 13th floor.
Some of the people get feared from Friday if it comes on 13th April. This fear is called as paraskavedekatria phobia.
At a dinner party Mark Twain was the 13th guest and one of his friend warned him not to go to the party as he was the 13th guest, which was considered as the bad luck sign.
Napoleon Bonaparte was also fearful of the 13th April, and this abnormal fear is called triskaideka phobic.
