Old Man and Punk Kid

This old guy is sitting on a bus just staring down this young punk rocker with purple and green spiked hair and studs through everything. The old guy keeps staring, and the young punk finally gets uncomfortable and says

"WHAT, old man, haven't you ever done anything stupid in your life?"

The old guy kind of grimaces and says "Yea.... once I had sex with a parrot. I was just wondering if you were my son."