A father's reply

I took my dad to the shopping centre the other day to buy some new shoes (he is 66).  We decided to grab a bite at the food court. I noticed he was watching a teenager sitting next to him.  The teenager had spiked hair in all different colours - green, red, orange, and blue. My dad kept staring at her. 

The teenager kept looking and would find my dad staring every time.

When the teenager had had enough, she sarcastically asked, "What's the matter old man, never done anything wild in your life?"

Knowing my Dad, I quickly swallowed my food so that I would not choke on his response; I knew he would have a good one.

In classic style he responded without batting an eyelid ...

"Got stoned once and had sex with a parrot. I was just wondering if you might be my kid."