13

The number 13 has been linked to untimely death since Jesus was betrayed by Judas, who was thirteenth person of the Last Supper. This helps explain why 13 is considered particularly dire in dinning room. One superstition states that the last to sit at a table for 13 will die within a year.
Another version is that the first to rise from the table will perish. So strong was the belief in England and Scotland that groups of 13 would sometimes try to cheat the devil by sitting or rising simultaneously, so that no-one would be first or last.
Friday the 13th is considered doubly disastrous because Jesus was crucified on Friday. Non-Christians, however, don't necessarily view 13 as unlucky.
In the Middle East, odd numbers tend to be regarded as good. In Chinese culture, instead of fearing 13, people avoid any number containing a four because it has the same pronunciation as the word for dead.