Six foot jokes

When Stephen Hawking's teacher asked him, "What do you want to be when you grow up?"

He said, "Six foot four."

I was outside digging a six-foot hole when I found a treasure box with jewels and shiny gems! I almost went inside to tell my wife, then I remembered why I was digging the hole.

What's 6ft long, red, and my girlfriend cries when I feed it to her?

A miscarriage.