Cursing kiddies

So here's how young it starts: My son was playing video games with his cousins yesterday, with much yelling and competitive chatter, and every now and then I would hear my nephew, who just started first grade, yell Jesus! in frustration over some losing move or other. I let it go a few times, but then I just had to go out there and do my "Thou shalt not take the Lord's name in vain" speech. Is leaving the tender confines of kindergarten and hitting the mean streets of first grade all it takes to turn kids into little blasphemers now? I don't know what sort of sociological conclusions we can draw from this, but if I try really hard I'll bet I can find some way to blame 50 Cent.