On a bus.

A young punk climbs on a city bus. The kid has spiked hair
colored green, yellow and orange. His clothing is a tattered mix
of rags, and his legs are partially bare and he has no shoes on.
His entire face and body are riddled with pierced jewelry, and
his earrings are big, bright, yellow and adorned with colored
feathers.

The young punk sits down in the only vacant seat, which happens
to be directly across the aisle from an old man, who just glares
at the kid for the next ten miles.

Finally, the self-conscious kid yells at the old man - "What the
hell are you looking at, you old fart? Didn't you ever do
anything wild when you were young?"

Without so much as missing a beat, the old man replies, "Well,
yes I did. Back when I was very young and in the Navy, I got
really drunk in Singapore and had sex with a parrot. I was
thinking that you might be my son."