What in the world is this squash, and what is it good for?

Question:I have a volunteer squash in my front yard. It vines out unlike a regular squash plant but, leave no doubt, it is a squash. The young squash look like baby watermelons. I have absolutely no idea how it got there but will be glad to accept this volunteer for whatever it is worth. Any help?

Answers:
There are many squash that resemble watermelon. Here are a few.

Acorn Squash:
http://images.search.yahoo.com/search/im...

Carnival squash:
http://images.search.yahoo.com/search/im...

Quincy squash:
http://images.search.yahoo.com/search/im...

Chilacayotas squash:
http://images.search.yahoo.com/search/im...

Could it be a gourd?
Check out these pics.
http://images.search.yahoo.com/search/im...
http://images.search.yahoo.com/search/im...