I know this probably isn't true, so don't feel the need to run to the Urban Myths website to find out.
A Texan buys a round of drinks for all the folks in a bar after announcing that his wife has just produced a "typical" Texas baby boy weighing 25 pounds. Congratulations are showered upon him from all around, and exclamations "WOW!" fill the air. A woman faints nearby from sympathy pains.
Two weeks later, the Texan returns to the bar. The bartender asks, "Say, aren't you the father of the typical Texas baby that weighed 25 pounds at birth?" "Yep, that's me," replies the Texan. "Well, how much does he weigh now?" "Seventeen pounds," answers the proud father. "Seventeen pounds?" says the puzzled bartender. "What happened? He weighed 25 pounds at birth."
The Texas father takes a slow swig from his Lone Star beer, wipes his mouth on his shirt sleeve, leans into the bartender and with his southern accent and deep voice says, "Had him circumcised."