At breakfast with my parents:

Dad: there was a car called an Austin?

Me: like an Austin-Healy?

Dad: I don't know. I heard a funny thing when I was a little kid. 

Me: what was it. 

Mom laughs like "here he goes!"

Dad: There once was a young man from Boston

Went to town and bought him an Austin

     He had room for his ass

     And a gallon of gas

But his balls hung low and he lost 'em

*much laughter at table 

Me: why have you never told me this before now?

Mom: he was waiting for you to be mature enough

Me to Dad: I think we've both just been insulted!