"Uncle Bill" joke
Little Johnnie sees his Daddy's car passing the play ground and go into the woods. Curious, he follows the car and sees Daddy and Aunt Jane in a "Passionate Embrace".
Johnnie finds this so exciting and can barely contain himself as he runs home and starts to tell his mother excitedtly:
"MOMMYMOMMY, IWAS ATTHEPLAYGROUNDANDDADDYAND.."
Mommy tells him to slow down, she wants to hear the story, so Johnny tells her; "I was at the playground and I saw Daddy's car go into the woods with Aunt Jane. I went back to look and he was giving Aunt Jane a big kiss, then he helped her take off her shirt, then Aunt Jane helped Daddy take his pants off, then Aunt Jane layed down on the seat, then Daddy.."
At this point, Mommy cut him off and said, "Johnnie, this is such an interesting story. Suppose you save the rest of it for suppertime. I want to see the look on Daddy's face when you tell it tonight."
At the dinner table, Mommy asks Johnnie to tell his story, Johnnie starts his story, describing the car into the woods, the undressing, laying down on the seat, and... "...then Daddy and Aunt Jane did that same thing Mommy and Uncle Bill used to do when Daddy was in the army."
Not enough votes...