I told my Grandad this one when I was 7 or so... he thought it was pretty good. Can't recall where I first heard it.
"A lion had just taken down the biggest, meanest Cape Buffalo in existence.
The lion was so pleased, she roared and roared over her victory. A hunter heard the roaring, found the lion, and shot her dead"
Moral of the story: "When you're full of bull, keep your mouth shut."
Not the best, but anyway.
Welcome aboard!