Going Blank Again Puns

A little kid and his dad were walking past a shop one day when the kid spies a bright red tricycle in the store window. The kid starts to beg his dad for the it, saying that he never wanted anything more than that tricycle and that he would never be bad again. The dad simply asks the kid, "Can your dick touch your ass?". The kid, disarmed, just says "No." to his dad, who responds "Too bad, then." and continues walking.

A few years later, the kid (now a teenager) and his dad were driving past a motorcycle dealership. The kid takes one look at a beautiful Panhead sitting outside and begins begging his dad for the motorcycle. The dad just looks at his kid again and asks, "Can your dick touch your ass?". The kid, who had forgotten the tricycle until then, just responds with "No." His dad just chuckles and says "Too bad, then."

Fast forward another few years, the kid is now an adult coming home from his last year at college to see his folks. The first thing he does when he sees his dad is put on a great, big grin and ask him "Hey Pops! Can I get a Ferrari?". His dad, again, asks him "Can your dick touch your ass?", but this only makes the kid smile even wider. The kid responds with an enthusiastic "You betcha!", beaming right at his dad.

The dad just stares blankly at his son for a little while and tells him:

"Then you can go fuck yourself."