Conjoined twin squash

This squash was picked at a friend of mine. It's pretty neat a conjoined twins summer squash.

It got me thinking though, my friends, like me, have twins. The usual saying is that "it's in the water" but I'm thinking at their house it must be in the soil. Now I am a bit concerned because I have been house sitting for them and ate some squash from their garden! Hopefully only a week there won't make a difference!