An old man is sitting at the bus stop waiting for the bus.
A punk rocker sits down beside him with a rainbow mohawk.
The old man looks over at the punker, and then looks away
The punker saw the man repeatedly looking at him, then when he turned to the man he would look away.
This went on for about 10 minutes until the punk got pissed and shouted:
"Hey old man! what the fuck do you keep looking at?"
The old man looked at him and said
"I got drunk one time and fucked a parrot, i was making sure you weren't my kid"