"Your manager said to shut up!" "Vera said that?"

I'm noticing a disturbing trend out there amongst a certain subset of Americans: the inability to conjugate the verbs "to see" and "to come." I first detected this trend while watching the local news and noticing that people who are often witnesses to crime or have been recent victims of violent thunderstorms were saying things like "I come home from work, and I seen that my trailer was blowed over." But then I was watching this show about megahogs on Saturday (and can I just say how much I'm looking forward to college football starting so there's something decent to watch on Saturday afternoons again?), and, once again, there's this guy from central Georgia stating that "I come up the hill in my pickup, and I seen this big ol' hog in the woods, so I shot 'im with my rifle." What is with this? These are not difficult verbs to learn. In fact, "came" and "saw" are just as short or shorter than what they're saying. And it's apparently spreading across the entire country! Sigh.