Let us see if this thread takes off.
Here is a start:

It is Donny's 19th birthday and he can now legally drink.
His father and grandfather had both walked across the Bay to the Yacht Club for their first legal drink.
Donny wanted to do the same.
He walked down to the water and started.
He was soon up to his knees in water.
Puzzled he came back out and decided to try by stepping off the dock.
That resulted in Donny being forced to swim back to shore.
Really confused now he went back to the house and asked his mother why he couldn't walk across the Bay like his father and grandfather had on their birthdays.
His mother looked at him and shook her head and then said:
"Donny, your father and grandfather were born in January. You were born in July."

This is a very Cdn. joke.