Lately I've come across a couple of references to the custom of breaking glasses at weddings. It seems that a number of people are enamored of the practice and so choose to add it on to their weddings -- even if they are not having a Jewish wedding. Some of them have come up with some creative ideas about what the practice means. They tend toward the superstitious like keeping away evil spirits or some sign of the number of years together to be expected. Neither of those are what it's really about. I don't know if they got their misinformation from some online source or by word of mouth, but just to set the record straight, readers can check out the source for breaking a glass at a Jewish wedding here.
If you want to learn the reasons behind various other Jewish wedding customs, like the 7 blessings, the veil, the chuppah, the kethubah, and the ring, they've been covered, as well. They are indexed at http://kallahmagazine.weebly.com/