a little boy keeps sucking his thumb. His mother says - if you keep doing that you're going to get really fat.

ON the bus a pregnant lady sits opposite the boy, he looks at her and says 'I know what you've been doing!'

2 race horses are talking to each other. One says I really love the way the jockey rides on me, and kicks me with his heels. The other horse say I know I turns me on when they wrap their legs around me and beat me with the little whip.
Just then a greyhound walks by and says - well I really like it too, when the put me on the race track and I chase that rabbit contraption but can never quite catch it..

THe one horse says to the other. Hey, a talking dog!