Why Don't You Say Macbeth In The Theater?

Its a superstition that if you say Macbeth in the theatre then you will be cursed like injury or death. It has happened to a few people I know but I don't know if its true or not.
Some examples:
One guy said it and he became blind, (he was allergic to the make up)
My friend said it and she was moving lockers around and they fell on her (she's fine)
My teacher said it and she had a nail go through her foot.

Its bad luck. I was in hamlet recently and before a performance someone said Macbeth. The next day, laertes forgot his pants, polonius lost the spirit gum (to glue the infamous beard to his face), ophelia's dress ripped, my dress ripped, my gloves ripped in half (both of them), etc

don't
say
macbeth
anywhere
near
a theater

Because if you do, you will explode and your friends will burst into flames and the entire cast of the show will start vomiting goldfish.

A few nights ago someone said macbeth and
our show turn out very very bad. I did not find out till the next day that someone
said it.