[DamnthatDavid]

Everyone has a "You had to be there" Jokes. They are the dead-ends of comedy that seem to crop up in any joke telling circle.
The teller, through gasps of laughter, manages to tell the joke to co-workers/friends/family, only to be brought up short as they all stare at the teller until he mumbles "Ya'll just had to be there" The ya'll is very important though.

Now, what I am going hinting at, is that I will try describe a "You had to be there" joke, ones so funny, that I had to drive my car to the side of the load or suffer the driving with side splitting contagious laughter.

Driving through Seattle with friend.
Get to a cross-walk. Asian guys walking really slow.
Friend says, "I wish they wouldn't take so long"
I say "If you yell Godzilla, they might move faster."
She doubles up laughing the contagious laugh, which I catch.

I guess you just had to be there.