Old D but Goldie

An old man is sitting in the park. Suddenly, a young punk sits down next to him, his hair spiked up in all the colors of the rainbow.
The old man stares at him silently, not looking away.
The punk gets angry. "What's wrong, old man?
What are you staring at? Didn't you ever do something stupid when you were young?"
The old man: "Actually, in my youth I was once so drunk that I had sex with a parrot. Now I'm just wondering if you might be my son...