Two policemen were having fun on the march, and one of them says: So I looked at the schedule of services and this year on New Year's Eve, on Friday, we serve again! And the other one immediately responds so honestly: Well, to make it thirteenth ...: D I take Friday the 13th as a complete superstition - and the full moon as well (not the fact that the Moon, according to the shadow of the Earth, goes through "phases" and one of them it is a full moon, rather that the full moon should have some direct effect on the psyche - it has a physical effect - for example on the tide). :O