"Billy the Rabbit escaping scientific lab" joke

Billy the rabbit was a scientific experimental rabbit, They kept him loecked up in a cage 24 hours a day with no room to run jump and play.
He was totally pissed off by this. One day, however, Billy discovered how to unhook the cage latch and open the door! Woah! He could escape - be free! He kept silent, then when night came, made his move. Opening the cage he leapt out and run for dear life out into freedom. He ran until he came to his old patch - all his friends were there still.
"Whey hey! It's Billy" they all cheered as the fed him gourmet lettuce and water. "You shall have the best we can provide" they all said.
Billy was happy that they remembered him and helped himself to the lion's share of the best food they could find.
His friends also gave him the pick of the chicks that night, "Here, Billy - chose whichever you want - however many you want!"
Billy chose Roberta and Hannah, he chose wisely - they were the best looking rabbits in the warren. They were at it all night, non-stop!
Billy was indeed a happy bunny. But morning came and he had to say goodbye to his old friends.
"You're going?" they questioned. "Where to?"
"Oh, I've got to get back to the labs" replied Billy.
"Back to the labs? But you escaped from there - you're free!"
"Yeah, guys, the food, water and chicks are nice" said Billy "It's all so nice, but I really must get back to the labs - I'm gasping for a cigarette!"