HELP!

I agreed (since I didn't exactly volunteer) to teach a Catechism class for my church. The church was (obviously) desperate. Anyway, I got stuck blessed with fourth graders. I don't want to say that they are little terrors, but they talk incessantly, giggle, fall off of their chairs ... you put it together. Not to appear sexist, but I have a class made up primarily of boys. Whose idea was it to give the new gal a class of boys? Trial by fire, I guess.

Today, I really have to get them under control, or I fear all is lost. I 'm thinking I have to come up with a game or something that we can regularly play if they get the "work" part of the class done in time. Any ideas? Any advice is welcome.