Holy Grail & Mary Magdalene?

Okay i don't want to sound wierd but every since i seen the movie the Da Vinci Code its starting to rattle my nerves a little bit but am i the only one that feels that away or am i just going crazy its like is that some thing to belive or some thing not to belive i belive in God ,Jesus 100% but what if that really is what the Holy Grail really is Help .... Can some one shead some light for me please thank you