Greg, Here's a cute one that I hope doesn't offend any Texans on the BBS.

It was the first day of grade three in a new town for Billy Bob. As a test. his teacher went around the room and asked each of the students to count to 50. Some did very well, counting as high a 30 or 40 with just a few mistakes. Others couldn't get past 20. Billy Bob, however, did extremely well; he counted past 50, right up to 100 without any mistakes. He was so excited he ran home & told his Dad, Billy Joe, how well he had done. His Dad nodded and told him, "That's because you are from Texas, son."
The next day, in language class, the teacher asked the students to recite the alphabet. It's grade three, so most could make it half way through without much trouble. Some made it to S or T, but Billy Bob rattled off the alphabet perfectly right to the end. That evening, Billy Bob once again bragged to his Dad about his prowess in his new school. His Dad knowingly explained to him, "That's because you are from Texas, son."
The next day after physical education, the boys were taking showers. Billy Bob noted that, compared to the other boys in his grade. he seemed overly "well endowed. This confused him. That night he told his Dad, "Dad, they all have tiny ones, but mine is ten times bigger than theirs. Is that because I'm from Texas?" he asked.
"No son," explained Billy Joe, his Dad, "THAT'S BECAUSE YOU'RE 18."

Boy do I hope Mike Skelton doesn't read any of the notes on this BBS.