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Glass.
.... The superstitious have always been fascinated by the curious properties of glass and the materials has come to be associated with a wide range of off beat notions.
.... It is a traditionally held in Britain to be unlucky to look at someone through a pain of broken glass, since this means that a quarrel between the two will shortly break out.
.... In Russia, guest are often expected to break their glass by throwing it over their shoulder, a gesture meant to appease their gods. .. One ruse know in several wives' tales is to take a surreptitious sip from someone else drinking glass, in the belief that it will enable you to read the others thoughts.
.... Drinking from a glass at four opposite corners, that is in the shape of a cross, is recommended as a means of curing oneself of illness.
 
.... Long ago it was thought a drinking glass that emits a high pitched ringing sound for no apparent reason is recognized as a death omen. . This superstition is particularly feared by sailors who will attempt to stifle the noise at once to ward off approaching death.
 
.... Should a glass vase be accidentally broken, this is surprisingly a good omen, promising seven years of good luck. . Where breaking a mirror is said to give seven years of bad luck.
 
I.M.Summers