you've probaby heard this joke before....

All of his life Ole had heard stories of an amazing family tradition. It
seems that his father, grandfather and great-grandfather had all been able
to walk on water on their 21st birthday.

On that day, they'd walk across the lake to the boat club for their first
legal drink.

So when Ole's 21st birthday came around, he and his pal Corky took a boat
out to the middle of the lake. Ole stepped out of the boat and nearly
drowned! Corky just managed to pull him to safety.

Furious and confused, Ole went to see his grandmother. "Grandma, it's my
21st birthday, so why can't I walk across the lake like my father, his
father, and his father before him?"

Granny looked into Ole's eyes and said, "Because, you dumb ass, your
father, grandfather and great grandfather were born in January, you were
born in July."